I wanted to report both of these issues only to find there is no issue tracking neither for Picasa, nor for Google Earth. Grrr! So the only way to tell Google to fix it is to use Forum? I will not leave this bug as it is - I want to use Google Earth and Picasa with pleasure, not with anger :).
I think that good solution is to let user to change those shortcuts. I understand that changing it now, when both software is quite long on the market, isn't an option. I would be more to happy to do it, if Google had fixed this bug.