We have used TIC's since Solaris7. It makes sense that the mech would use a 3 trigger/button firing system. It's much like the modern fighters.I realise modern fighters have fewer guns but think about it in ranges. Short range tic,long range tic, mix of both...
We use 3 tics and you chan change them every turn if you want but you only get 3, so if you have a mech with say 4 ppc's you can link all 4 together,2 and 2, 1 and 1 and 2...but you only get to roll 3 sets of dice. Rolling for location is seperate.I think it speeds up the game and adds realism.It has worked for me and every one i have played with since then and every one has seen the benefit of using that system.