Hello MDK runners!

I am a big fan of MDK and I'm considering learning to speedrun the game. Because I'd like to stream my attempts and also want to have my splits on the screen, I would like to run MDK game in windowed mode. The game itself does not seem to support it, but I managed to run it in windowed mode with the "Dx Windower" tool.

Since this is an external tool my question is: is this tool allowed when speedrunning MDK? As far as I know it does not alter the game, but modifies the output window so that it can run in windowed mode.

How do you guys do this? Also, are there other rules I should know before running the game?

Thanks in advance!