1 shot because it is a semiauto
Not designed for full auto modification.
They will do special orders.
the only legal way is to put in a registered class 3 auto sear
Sadly JT did not put the ability to make it full auto. The double trigger style allows for fast shooting. JT has however released more markers with this desired feature.
you use the toster
Not factory
The batteries make the gun go full auto.
You need to contact the BATFE for the appropriate paperwork first.
The mode your referring to sounds a lot like "NPPL mode". This when you fire semi auto for 3 shots and it then turns into full auto. Sadly the E-grip does not have this mode, though you can put it into full auto mode.
Buy a Spyder E-trigger.
it honestly depends on your experience.