Hey, thanks for the feedback. I'm glad to hear people like the mod!
I'm quite familiar with the music system in LOTRO, and I agree, using the keyboard to play would be a lot easier than with the mouse. I'll have to have a look, but I think there may be a way to bypass other controls when in 'playing' mode. But I'm not sure. The main idea was the playback of abc files, and I hadn't thought about other ways of playing, really.
As for other instruments, they're fairly easy to add so long as I get a model and the sound samples. But what I really want is for other modders to easily be able to add their own instruments.