Scramble: I’m playing in a Las Vegas scramble where 4 players play a scramble off the tee and then play their own ball from there. Could you still enter data on the holes with my drive and then do pick up on holes that my drive is not used? Would you recommend a different way?

Yes, that’s the best way. The issue with a ‘pickup’ is that it automatically turns all subsequent shots into pickups.
Note that if another player’s drive is used, and you hit the second shot, that can be entered (e.g. just enter a shot starting from 213 yards in the rough).