Nice to know about the next version. However, this basically means, for people with many plugins, it mainly depends on the name of the plugin, if they can access it in WaveLab or not (in other words, if it is still visible on screen or not).
Frankly, I do not come across angry, because I am not, but being a developer myself, this looks like a severe design error me, because it is not too wise to put a list of entities of which the quantity is simply unknown, into an unscrollable menu. 
Can’t you at least supply an update for WaveLab 7 that uses scrollable menus for plugins (such menus exist, e.g. the context menus of Windows Explorer work that way) instead of multi-column ones. Not very pretty, but at least usable and probably fairly easy to implement.
A car manufacturer that has severe brake problems with a car model also can’t fix it in the next version of that car model.