The only improvement I could think of for Maverick would be adding more ejector airtime hills. Maybe make the launch accelerate quicker. As you said, the restraints were fixed. Other than that, Maverick is perfect.
I'm not familiar with DP layout, so where would you think a good location for a Coaster like that would be? Would a Coaster removal be necessary?
I think it would be a good idea to replace Stinger with a GCI wooden roller coaster. Except it should have steel track, made by Schwarzkopf, have 2 loops, and named Laser.