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Nope no programming required it is a simple time pulsing trust me. we designed the first one with actual software. That being said if all you wanted is rapid fire on the trigger we could write a program for a 8 pin chip.
The 555 timer is a pre programmed chip which cannot be altered. People use this to do the trigger rapid fire with the help of a NPN transistor creating like a switch that opens and closes with each pulse of the 555 timer. I have created a more advanced macro controller with software I wrote with a pic programmer. The diffreence with a 555 time and a chip you program your self is with the chip you program you can ajust the speed of fire eg ( 30 Ns ) rate of fire ( 3 round burst )...