Today I found out that pausing and unpausing can be used to play the game one frame at a time, essentially allowing you to do a TAS without needing to modify the project in any way.

Should this strategy be allowed?

are you sure that's a bright idea? that takes ages and it's probably inconsistent.

The TAS does take a while to make, but if you can find out the right combinations of inputs you can make really fast runs. Also, it’s pretty consistent to unpause for just one frame

I guess it's up to you to be honest. I don't think anyone would want to spend their time looking through frames of inputs and mark them down with a piece of paper, and it's easy to mess up. If you can do it, whatever.