It might be mapped to the skill hotkey ID, but that would require the entire system to be changed so the skill hotkey ID would be treated as item hotkey ID. -_-
I won't add leader action control because it's kinda pointless to make an enemy leader force actions of other enemies. It would be just unnecessary extra code repeating the same thing over. Instead of making deciding actions, the leader would decide the action of a minion additionally. So meh.
Swimming will be implemented later, I haven't forgotten about that. It might just be the next major feature that is added.
The sounds will be added somewhere later as well. The main pain-in-the-ass is the config app.
That bug with two enemies running an event code was fixed I think.
The sprite bug was fixed for sure.
I implemented boomerang-returning-items a long time ago.