im glad im not the only one doing this.
im surprised that your log pots aren't working correctly. luckily it's easy and cheap to try linear pots. they have some ip67 pots at mouser for 11 bucks each.
i have a skin that you can use/modify with large buttons. i ended up not going with an installed touchscreen and instead a tablet pc running win7. but it's still big enough for a 7" screen
here is a video of it on a tablet
i was able to control track listings and pumps via my phone as well. it's pretty simple if you use event ghost.
I'm also looking into fusionbrain right now. i want to integrate a position control of my power wedge and also integrate a depth gauge with possibly having an alarm. but there is an led controller already out there. check out the mjsgadget rgb led controller:
my progress has slowed down though... rather spend time on the board then tweaking the computer.