Set .tmp value of piston to a higher value like 9999
Default is 31.
So far there's no way to do this. You can make it push as many particles as you like in front of the piston, but there's a limited amount of FRME it can control. If you want to move wide loads, I suggest you use multiple PSTN rods attatched to one long strip of FRME.
Oops i thought you want more particles to be pushed.There is no way a single piston can push more frame you will have to use multiple pistons connected to a single larger frame for it to work.