It would be possible to shorten a Tavors trigger pull, as well as add features, but it would come with buying microswitches and adjusting the exsistibg trigger mech, and getting a wired in fet, such as a Gate Merf3.2 or something.
I'm not sure what an E-trigger does exactly for paintball, but I would assume its something like a hair trigger, which for that sort of performance is possibly, but you definitely picked a trickey platform for it.