With unlimited RP:

: Once you reach the fourth office, invest in the R&D Lab. It generates RP passively while funded, even if no specific projects are active. Increasing its monthly budget directly boosts research output.

Late-game game engines and game reports are high-yield RP sources. Creating specialized engines with numerous features significantly increases the RP return based on development time.

Believe it or not, you don't need a mod for unlimited RP—if you are willing to exploit a pre-1.5 version glitch. (Note: The developer, Greenheart Games, patched this in later updates, but many mobile and older PC versions still have it.)

External trainers let you toggle cheats on and off with keyboard shortcuts.