hello silderan, Merry Christmas and welcome! I'm glad to know you like the engine
as for your question, I didn't understand exactly what you mean; are you looking for a way to limit the FPS count without using vsync? or are you talking about modifying renderer.time_factor() in some way? and if you mean the first option, why don't you want to use vsync if may I ask?
alright that's what I thought. well there is no built-in method to limit FPS other then using vsync. you can try implement it yourself (never tried it myself), just be careful not to mess up time_factor() on the way.