sure I move around. Its the returner's responsibility to try to get in the servers head.
My favorite thing to do is to set up for a normal return and while the ball is in the air, move as close as I can to the service line. I am usually good enough to chip the return from there and make it to the net. Its a big surprise for most opponents.
Sometimes I'll setup on the service line on 2nd serves just to get in their head. I know I can handle most second serves from the service line and for most servers, having some one at the service line is offputting.
And I grew up expecting to win my serve, lose the opponents and get to the tie breaker, so I dont mind taking risks on returns.
Dunlop Biomimetic S5.0 lite modded to 353g (97g added) 5 1/2" square grip
Ashaway Kevlar 18g/MonogutZX 53/41lbs