Yes you can get a USB chord for a Hitech laser 4. it plugs into the buddy box trainer port.(make sure to get the right chord for your radio, check with your local hobby shop)
The H9 P51 will be more aerobatic than a standard trainer with everything removed ect... BUT some say it is a bit harder to handle than a standard trainer.(even when set up for beginners) That is a matter of opinion and I have not flown one myself. I am basing my coments on what I have read here or there.
If/when Hanger 9 releases a P51 PTS ARF I will be the first in line.