I'd like to share my experience with running UIAutomation (0.8.3) task via Jenkins slave.
It's quite easy to setup Jenkins slave via web start app.
You should use normal login screen to Windows, not RDP.
If you connect via RDP to remote machine and start the slave app UIAutomation will work. But when you disconnect from RDP session or minimize RDP window, then UIAutomation won't be able to locate Window.