I think the answer is "sort of" I'm just starting to learn Lua scripting but it looks like the functions are there to detect an incoming object, and check if its a weapon and is GPS guided, from there you could explode it. Simulating the fact that it had been jammed off-course. you could get more fancy and code in some distance from the jammer calculations to influence the chance of triggering the explosion. Hopefully, someone with more DCS coding experience than me can comment on if this is a feasible project or not.