I suggest an in game stopwatch that can be synced with the pause button. Online stopwatches don't work well because changing the focus switches screens (can be circumvented by tiling windows, but see my next 2 points.

I would also like an option for the stopwatch to stop when the user presses Pause. Additionally, I would like the number of frames elapsed shown also.

This would be useful for timing anything, so this addition would ultimately be a good addition for all TPT users.

I guess so, but it's only what happens in the TPT world that matters for timing.