I installed the safety trim system - just for pitch, but you could do
it for all 3 axes if wanted.  You can use a micro switch on the flaps
or a speed switch to have a "fast" setting and a "slow" one.  Has some
other nice features to prevent runaway trim and you don't need to use
those pesky ray allen relays

http://www.tcwtech.com/Safety-Trim%20Page.htm

I had another system that never worked, but this is easy to install
and works as advertized.

Dan Ballin
LEG2  N386DM