You can do this but it takes quite a while because you have to make a custom list for plugins. In the preferences window in Pro Tools, under the mixing tab (i think!) is an option to display your plugins by type or by manufacturer or both (i personally use both). Now when you try to insert a plugin you will get a massive list of all your plugins by whoever made them. This will likely look very untidy.
So - close Pro Tools and open the VST to RTAS converter. Each Plugin will have the name of the manufacutrer in the 'Vendor'
column. This is where the anti-fun begins. Go through all your plugins and change the vendor name to a plugin type (ie Rever,Dynamics etc). This will probably take quite a while but when you next open Pro Tools the Plug In menu will be a lot neater. This will NOT make them appear in the standard Plugin list - They will only be ordered like this under the Manufacturer plugin list.
I hope that made sense. If not then just give it a try and hit me back with any questions.