White tiger, those are alot of neat suggestions. (Also sorry about double post but the attached image at the end makes it too blorp to smash everything into one post)
Unfortunately, the stuff with the clipboard and text limits are engine and networking based and there is really not anything that can be done.
The sub categories thing is actually technically a built in feature. If a modder wanted their events in sub categories, they would create an additional dropdown parameter (ive been telling people to do this for so long but no one does)
The drag and drop event manipulation is actually somewhat less simple than you might think because it requires ripping out the gui data for that line of event and placing it on a mouse event overlay of some sort and doing some frightening math to figure out where it goes back on when it is dropped (especially considering that there might be some scrolling involved and stuff).
Pretty much all the event suggestions you have would require quite an extensive overhaul and would only really be worth the effort if I was making a whole new event gui. However, event saving and single line adding is a potential, since I plan on extending the eventbot capabilities of BuildBot.
Poll