Are you using keyboard emulation for this? I mean, wiring the switches to a keyboard controller board? This is a problem indeed for those, since the keys will repeat if you have them constantly "ON".
I think there are two solutions:
* Use FSBUS - it can handle toggle switches so that when a switch is ON it is also ON in Flight Simulator. Or it can generate a momentary pulse. FSBUS can create keyboard events and mouse clicks for you if needed.
* Use a relay circuit. There was this:
http://www.flightsim.com/cgi/kds?$=m...wto/toggle.htm
- basically a small circuit to do this.
But if you start thinking about the relay stuff, you might just as well build FSBUS - it gives you a lot more as well if you wish to expand the cockpit later.
Tuomas