Couldnt tell you about powercinema havent tried it yet, imagine it wouldnt work straight off, as grub overwrites the mbr as you said.
Would imagine it would be possible with some tweaking havent tried as such yet.
As for fedora, no problems other than the audio and the fact that 1440x900 doesnt seem to be supported. Currently using like 1280x800, looks fine, would imagine 1440 is accomplishable with a little work.
I only installed like yesterday, and ive been at work today so havent had much time to mess around yet.