i love klystrack! it's like I've found the tracker of my dreams :3 I had trouble compiling it for 64bit linux (and the 32bit binary was old and super laggy) but after fixing some wonky make errors and adding fixing a few weird bugs that are apparently only present on 64bit compilations, it's working and I love it~ (the cool cat-o-meter still seems broken though o~o)
i heard there was some kind of midi support, but i'm guessing that's only for windows? the one thing that I would love to have added the most is midi support, including support for linux. the ability to control it externally is the biggest reason that I think midi support would be the most powerful addition.
i imagine midi channels would correspond with the tracker channels, midi patch change commands would correspond with setting the current instrument for that channel, and i think it would be sooo cool to be able to control synth parameters, like with something like right click a control -> learn binding -> move the midi control
and i've seen it mentioned before, but a live screen would be amazing too, but i still think midi is more important, because then at least you can have external live midi loopers controlling it