Welcome to the Forums Aleck!
Yes, I do have my trim mapped to 2 rotaries on my X52. Also, I really didn't have room for them on the Flight tab. The combination of both of those made it an easy choice not to include them.
I do have a new version of the profile I have been working on since I began flying online. But I don't plan on adding the trim buttons. Actually, you are the first to ask for them since I released the profile.
You are welcome to add them to the profile yourself and for your own use using a graphics program and the TB Toolkit.
Also, if I were to buy a new touchscreen that one you posted may be the one I would look into... I would want a 10" with a native res of 800x600. What price are you seeing for it? I paid about $165 for my 8" Innovatek TMT-868 shipped on eBay, and that was a pretty good deal. It has a native res of only 640x480 which is a little small, and I wouldn't mind it to be a little bigger. It's handy for other things besides TouchBuddy, and more useful if it were a little larger. Right now I am tracking weather radar as a storm moves though on it.
WBK