Here's a proof-of-concept example of using kterm's -e and -l options to launch a terminal program from KUAL with a custom interface using matchbox-keyboard's layout config, in this case a media player with basic controls (play/pause, forward, back, next, previous, volume +/-, off).
This is just an example and not of much practical use since it just plays *.mp3 in a folder, but the concept can be adapted to other things (or a media player with a better frontend, at least). Hopefully it'll give someone an idea to play with.
No screenshots since I apparently can't do that when kterm's running a program. Just imagine an ugly text-based media player with hastily drawn media buttons under it.
Install:
Put the attached mplayer_test folder in your extensions folder.
You will need mplayer provided by baf from the bottom of the page here:
http://www.fabiszewski.net/kindle-xterm/
Put mplayer in any of the following folders (or edit mplayer_test.sh):
/mnt/us/bin
/mnt/us/opt/bin
/mnt/us/extensions/mplayer_test/bin
Put some MP3s in /mnt/us/music (you can change this location in mplayer_test.sh)
Launch it from KUAL.
Notes:
Matchbox-keyboard's README with layout info:
https://github.com/Xlab/matchbox-key...xlab/README.md
There's a bug of sorts with kterm (and xterm before it) where some programs won't execute right if just run with the -e command (e.g. "kterm -e foo" will open kterm but then immediately exit without running foo). I don't know why this is but you can get around this by putting the command in a shell script and using -e on that instead (e.g. "kterm -e foo.sh" where foo.sh contains only "#!/bin/sh [linefeed] foo" -- see attached example for example).