I know what you mean about wanting the tool on the ground so it doesn't move when you're pushing wood through. The same's true for table saws. Yet, I have one of each that are mounted on castors and have found that feature to be useful. When I want to keep them from moving, I just put a thin strip of wood on the floor behind two of the castors.
My shop is not very big and so it's helpful to be able to roll stuff around. ( I have six table saws and five bandsaws

). Sometimes the saws on wheels get rolled out of the shop when I want to keep the dust down. Delta made retractable casters that come down when you step on a pedal. (two wheels per pedal) They're cool, but the wheels are very small. I've also seen a pair of wheels mounted behind two of the legs so they sit just off the ground and they ride on the floor when you tip the tool in that direction.
I mounted this little INCA saw on a rolling base and used it to cut some long curves in 5 1/2" thick 6x12s when building a large arbor. That was probably the most fun I've had running a bandsaw. I suspended the piece just above table height and pulled the saw through the cuts.
