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I absolutely loved the RollerMouse before I got my Kinesis Advantage. It might work for the Freestyle though so you could consider giving it a try. Still the most ergonomic mouse I've used to date.

I use a Wacom tablet instead of a mouse or trackpad. Holding the stylus pencil-style is very comfortable once you get used to it.

I use a Wacom for some tasks, but I find it even worse than a mouse if you are switching back and forth a lot. For drag and drop I recommend the Contour Design Rollermouse Red. The downside is it doesn't pair well with a deep keyboard, as it wants to replace any wrist rest.

I use an Evoluent mouse and it's been a revelation for how much a regular mouse was tweaking my right arm and elbow.