As with most PC games rebindablity is nearly essential. E to use or F, whatever someone's preference is. My suggestion with rotation is based on flight controls commonly used in games. Essentially a system for a rotation axis that can be rebindable. Alt and ctrl-alt is not currently rebindable. Also E in this game isn't use its equip. Not used very often so I don't see the issue with having it moved if necessary; but that is just something that gets worked out with rebinds and personal preference.
i would say that E is good e for equip now F? thats bad that would not make sense (but if you make that a lamp hot key that would be cool) ctrl is a good button for rotating use, theres just something about use E that makes me want it for equipping stuff or as a use button if it dos something like rotation it just would bother me to no end mabby R would be some use if you dont like ctrl?