Hot on the tail of version 0.1.1, I have just released CrabEmu 0.1.2. This release contains a rewritten Z80 core, modifiable controls, better rom loading (and the ability to load one rom after one has already been loaded), and a few other improvements.
As always, please report any bugs that appear, as I will be more than happy to try to fix them. :)
Enjoy the release.