Could a manual trigger be set to trigger several explosives? It's located in Force Unleashed, pg 100. Like, could it be set to wire up 5 different blocks of detonite (assuming all are within 30 sq of the trigger)?
What do you want to blow up? A building or enemy troop?
I think that each cube of detonite would need a separate manual trigger. That is something like an explosive cap, a small mechanism to activate the cap and a 45 m long line/wire to activate the mechanism. I think that you could link them together with a Mechanics check, but it would be a GM call.
An alternative would be to set the explosives in all 5 locations with 5 checks, then connect those explosives with detonite cord from Galaxy at War page 43, with another 5 checks. With the last two checks you set the detonator and the manual trigger. As that is a total of 12 checks, I would recommend using take 10 on all of those except to set the detonator. There it is not allowed as failure has some serious effects... With movement between the placements and all the checks it could be done in about 2-3 minutes, minimun 16 rounds if you are very efficient.