Right, before this gets WAY out of hand, and since davidc's away for a while so we won't be getting an "official" policy post or and anything regarding a possible new "Sandbox" category anytime soon...

Here's a few guidelines / suggestions / thoughts regarding the current situation and various types of add-in.

What follows does not (necessarily) reflect the views, opinions, policies or other vague rantings of goofans.com, its creator or the moderators. They can rant for themselves.

First a few definitions... so that we're all on the same page.

Add-ins that we like

And will almost certainly published immediately providing they work, and look OK.
New and Interesting "Normal" Levels that use original balls only.
New Normal Levels (or a series of levels) which contain custom balls that were created by you
Theme Packs which make only graphical changes to the original balls and or levels
Graphical only changes to the WoG Corporation balls (Drained and DrainedISH)

Add-ins that are "OK", but we're not hugely keen on.

Yet-another-Sandbox
For those who don't know, the original "sandbox" levels were created when testing out ideas for levels was tricky, and annoying. So a "sandbox" was a great thing because you good just "mess about" with lots of different types of goo, and experiment with many of games features and concepts without having to beat your head against the XML or WogEdit.
Now WooGLE's "getting there" it's a lot easy and quicker to whip up a quick test level, add a load of goos of the types you're interested in, and really test your level concept before you go ahead and actually make it.
We've already got several very good "sandboxes", so is there really a need for a new one that contains a couple of extra dispensers for goo types that aren't that useful in the first place?

Dispensers are WEAK!
Pretty much dispensers for all the "useful" ball types already exist. Creating new versions of existing ones is already causing problems (see recent comments in momo's No-limits sandbox), and creating dispensers for "useless" Goos is (IMO) completely pointless.

Dispensers are only any use at all in a "sandbox" (see above). Using dispensers in "Normal" levels is almost always pointless and/or a bad idea, there's usually a more interesting way to complete the level using some original balls. If you can think of a really good level design where you NEED a dispenser, great, otherwise keep them out of normal levels.

Levels that use other users balls
We're OK with it, but you need to check its OK with the creator first and make sure they don't intend to make any changes in the near future. Otherwise we get different versions of the same ball in different addins... and that way madness lies.

Graphical changes to just one original ball (not WoG Corporation)
If you want to test a new look for a ball, please change one of the WoG Corporation balls, not Common or Ivy etc. Happy for "Theme Packs" to change pretty much anything, but if it's just a "one-off" or a test use Drained or DrainISH.

Add-ins that we don't like and probably won't ever be published (Sorry)

Ball only or Balls with a quick "Test Level"
If you CAN'T think of a good way to use your new ball, why did you make it? (see thread title)

We'd like to keep this site and the add-ins level driven, so if you've got an idea for a level, and it'll need a new ball to complete it.. fine! If you've designed a proper "custom" ball which you plan to use in some levels, and you want to see what people think first... OK, but make your "sample" level interesting, and not just a test.
DON'T just create a "Minor Revision" ball and a Test Chamber and upload like "Hey, look what I created in 2 minutes".

Ball Addins that just create balls
As I said above, we're trying to keep the site "level driven".. if you want to create a set or series of "custom" balls and use them in a number of levels (see inwog's Metal and Element levels).. that's fine.
But don't release the Ball Pack on its own, or with just a "test level" tacked on at the end.. so that it's got one.

Balls with the same name as an existing custom ball
We're already seeing problems created by 2 balls with the same names that are available from different users / addins. It's going be nearly impossible for us to police that, so you should make sure that no other ball already exists with the same name as the one you're making. If you want to be certain... just put your user name / initials are the first part of the name.
BUT we're also against duplicating balls... so UserA_PilotSP and UserB_PilotSP will be a problem.

All that being said....

I'm fully prepared to take reponsibility for "all this mess"... I mean I made WooBLE and released it with really thinking about what it might do or how people might use it. (Now where did I put those self-replicating nanites?)

Unfortunately it's been adopted quickly, and without guidance from "the old guard" it's been put to unwittingly diabolical use by many keen members.

Technical difficulties aside, if there's one thing you should remember it's this...
We, the mods, have been at this a while and like showing off.
We like levels.
We like innovation and interesting things to play with.
We like solving new problems.
We like collecting more goo, in less moves and faster than anyone else can.

We don't like intractable problems and constant hassle.. however innocently created.

Thanks for listening.
DaB

Now... let the ranting / backlash / full-throated support(?) begin.