So, I play a lot of fighting games, but they’re not on Mudfish’s application list, so I want to know if there is any way to set custom programs (.exe) to use Mudfish services instead of me risking ending all my PPT with background internet usage.
I think you need to check Create Custom Item section. 
Please check and let me know if there’s any issues to use with Mudfish.
That’s it! Thank you very much. Already bought some trafic to use Mudfish again.