Yes, we'll need those RCS thrusters. I'd like to do the coding for the lander, because I want to implement stuff such as thrust-vectoring, and I'd like to avoid a dependancy with VB (that I like a lot, that's not the issue). Also I'll need to figure out some landing autopilot, probably going to be quite a challenge but should be interesting. AFAIK the RCS thrusters are 150N each and the main engine can throttle between 1500N and 7500N. The powered descent is not longer than 90 seconds. I'm not 100% sure about the main engine TVC ability, I have to find more sources about it.
According to Wiki : 20x 250N + 6x 25N thrusters for the lander attitude control.
According to Wiki : 20x 250N + 6x 25N thrusters for the lander attitude control.