I have currently a Problem with Red Alert in Linux (Ubuntu 12.04 + Ubuntu 14.04).
I play in Full Screen because of the Unity/Pseudofullscreen Bug - and i have to say the Mouse Cursor speed is extremly slow - almost unplayable.
While on the Desktop or in any other application i have a pretty fast mouse speed - in this game not. I have no idea how i can change that.
You can easily fix the unity/pseudofullscreen bug on Ubuntu >= 13.10 by installing the libsdl2 package. The game will automatically detect and use SDL2, which includes a fix for hiding the Unity UI.
We plan on integrating this fix into a future version of OpenRA by shipping SDL2 ourselves.