I have one question.

I plan to use 8 injectors for four cylinder engine. Is it possible that on one revs range squirts only four injectors and for other revs range squirts all injectors? What I need to do it?

There is a highly simplified staging on GenBoard/UnderDevelopment/StagedInjectors assuming the secondary injectors are arranged in 1 bank (requires recompile and careful configuration and testing).