I would like a rotary were when you change the give the stoke length does not change.
A Rapier2 with removable plug in motors of different torque, speed & voltage range .
I would also like to one were the motor is not mounted in a frame but the motor ouside can is part of the frame itshelf, ie would have a back end much like a r/c motor where you could replace brushes etc with rca machineed to the frame/ can on top-facing back or molded to the back removable houseing if clipcord.
What i do like about rotarys are the light weight, clean looking, noise level and less skin tramua.