Then I'd find a way to drill and tap the trigger for some trigger stop set screws to handle fine adjustment. If the microswitch proved to be a problem I would look for a 'sharper (quicker and less sloppy activation point) or a 'lighter' one for less of a pull.
Sounds like your a step a head of me so I am going to just run with it
The only down side to putting the screws in, is the stock plastic trigger and most of the plastic double triggers are too soft to take the threads very well and would strip with use. So one would have to be made out of metal or Lenex (sp?) if you want to stick with a plastic.
Also in Tippmanns the switch is close to the trigger's pivot point so it needs a longer pull. But if you move the switch down to roughly the middle of the trigger it will shorten the pull needed to trip the switch.