I added a new Dialog to my Interface plugin for Virtools Dev 3.5. It allows to quickly delete all attributes from one or several categories. The standard attribute manager moves the attributes if you delete the category but does not delete them.

In 4.0 you now have the possibility to delete all unused attributes, but I think Matthew said, that it doesn't consider attributes used in VSL scripts - what might be tricky to support. I don't know if this was changed for Virtools Dev 4.0 SP2, but 3.5 users have now better control anyways.
Download the plugin for 3.5
Enjoy !

p.s. here is a little chat log from the IRC channel, maybe it helps if you are unsure how it works:
[15:47] LeDom: ok, it takes less than 20 seconds to free you from 470 attributes
[15:47] LeDom: just did a test with one of our projects at work
[15:48] LeDom: a) install DLL
b) start dev 3.5
c) load CMO
d) open main menu -> Dom's -> "Delete Attributes by Category"
[15:49] Vsaiwrk: nice.. thats a lot faster >:)
[15:49] LeDom: e) hit the button "select all"
f) click on the categories from your project to deselect them
[15:49] LeDom: g) hit the "->" button
[15:49] LeDom: h) click DELETE button i) close the dialog
[15:50] LeDom: k) go to the attribute manager j) if it still shows all the attributes, close it again and reopen it
[15:50] Vsaiwrk: have to close and reopen the attribute manager if you already had it open still
[15:50] LeDom: (yeah f5 doesn't work here)
[15:51] LeDom: l) open "-No Category-" tree/section
[15:51] LeDom: j) select all the attributes in that section using shift
[15:51] LeDom: l) hit "del" key
[15:51] LeDom: m) done, enjoy, relax be happy
[15:51] LeDom:
[15:52] Vsaiwrk: deleting the category deletes the attributes in that category also here.. you're saying it should put them under no category?
[15:53] LeDom: ?
[15:53] LeDom: no, but you may have some there by default
[15:53] LeDom: it does kill them all but no category is no category and therefore not touched
[15:53] LeDom: by my dialog
[15:53] LeDom: maybe i need to add a button for this too
[15:53] Vsaiwrk: gotcha
Sherwood Dungeon is a MMO game created by a single person …. using Director ! If you like, you can also read an interview (part1, part2 ) or the developer's blog.

Last week typeRice asked if somebody knows a way to hide all 2D frames at once. I remembered that there is a 2d root object and suggested to get it and hierarchical-hide it. It worked! He then found out that you need to restore the state with hide, not show.
I now added some commands to my HTMLView Virtools interface plug-in, that allows to hide, show, and hierarchical hide objects by name and type. This way you can create your own GUI i.e. for quickly hiding specific entities.
The beta-1 version of the plug-in was released the 1st July 2006 and since then downloaded 96 times which doesn't sound much. It was the second release that featured a new font-setup GUI for interactive font-settings tweaking. Based on the feedback, Posy seems the most interesting element of the collection. Personally, I also use the time slider and the animation slider a lot. The HTMLView has a lot of potential but I only implemented a small subset of the ideas I have. In 2006 I used it to manage a presentation with it. It was at the FMX where my boss and I - together with our reseller - did a speech/demo/presentation about Virtools for game and shader development. I did a life demo of how shader development looks like when using Virtools DEV and then showed some shader examples from our projects and the online community. I was told that the people of the audience looked impressed. HTMLView helped me to quickly load the CMOs I wanted to demo and the HTML page also contained shader code fragments that i could copy/paste to make sure that the demonstration run smooth and quickly. I think Virtools teachers and trainers should take another closer look at this, if they don't use it yet. It might be a good support.
Download of the new version for Virtools DEV 3.5
Please provide me with feedback, thanks.
If you are using Virtools 4.0, I am sorry to say that there is currently no plug-in available for that version. I hope Virtools finds an acceptable solution in regards to the new EULA and web-publishing for every side, soon. Maintenance was paid for upgrades, but the EULA change was a heavy downgrade.
Let me end with some pictures from the FMX 06
