I don't know if it is possible to install on a Kindle Fire (yet), but I have Nook Color rooted and it runs really well on there. The NC can be had for 150 refurbished now. Granted the Kindle Fire does look like it has much better hardware behind it (dual processors, etc.) so it might be worth it to ...

Regarding sound in Monkey 1, I think depending on the version of Monkey 1 you imported, you might have to assign an Extra Path in the ScummVM Game options to point to the audio files.

I would also like to echo the Trackball Sensitivity!

And thanks for the great port!