I would also like to see taming based on Harddisk activity ... (My AV/Spyware programs uses alot of Disk Time but not processor time).
Not sure what you would do for the memory usage issue (Freeze the process?) .... Firefox and Chrome won't like it :D
Profiles would also be a great idea. (i.e. Presentation Mode - Nerf the AV/AntiSpy/Windows Update and all the other good stuff that tries to grind the PC to a halt).