I have two 970s in SLI and would love to be able to see the time series data that GPU monitor shows for both cards at the same time. Switching between the two is makes it very hard to compare the data.
I'll second the multiple monitoring widgets as I run a Crossfire rig myself.
The other thing I don't see but would love is the ability to set a default fan profile. Yes we have power saving and gaming, and we can save others, but there's no apparent way to automatically set a default profile when it launches. I've saved a custom profile and have to manually select it every time I boot up my PC.