Running 6 PWM motots and Ir IRremote.h - Can it be done?

Projects General Guidance
2

Can I do this with the Uno

No.

  1. reconsider my input control and not use the IR at all (maybe radio?)

Why are you asking US that?

  1. use an Arduino Mega

That would work.

  1. reprogram the IrRemote.h library to allow me to use Timers 0,1,2 ; or 4)

How many timers did your research show the Uno has? How many PWM pins can each timer drive? Which timer does the IR library use?

The bottom line is "which two pins don't you want PWM to work on?"