You own a Mac. Your argument is invalid. Just kidding. I am very much doubting any of the developers have a Mac let alone a trackpad but if any of them do then I am sure they would be happy to help.
there is a ton of people playing powder on OS X :P it's that good of a game plus it's cross platform, so yeah :P I'm pretty sure Simon is using a Mac so that's one big thing right there.
rest assured i have a real computer (in fact two of 'em) with a proper mouse input. i brought a mac mini in may for my birthday 'caus i've been using windows systems my whole life and i wanted access to the platform (without faffing about with hackintosh). i keep it on my bedside table so i have 'a' computer to use waking up and going to bed.
so the trackpad thing is great for a mouse replacement since it wireless which means i don't have to get uncomfortable (like i do when i have to type something ) its just not functioning as well as i though it would in powder toy.