Befeore I waste a new thread I just write in here that a new and recent OpenTTD version is available in the Repo, thanks to the Author. It works good, with Touchscreen (using Nubs of course also works nice) and also seems to be very fluid. Only the Musik does not work in my case and skips fast through all tracks. But I'm sure this is because I didn't had Timidity installed, so no problem.
Donwloading of graphic packs and plugins like new AIs also works if you have enabled WiFi so you can expand yout OpenTTD with alot of nice new Graphics and stuff. ^^