Apologies, I'm asking similar questions in multiple forums, but I just want to be sure I do things right when I do them :)

I notice there aren't many rules for Mercenary 100%, and so I wanted to check first. Is it merely a complete playthrough, without abusing glitches?

If so, similar to my post in the MW2 forum, would a submission be okay as long as it is a recording of the game from start to finish, even if reloads are necessary for mission failures? Obviously, that would be sub-optimal, but I would like to complete a run and then submit it, and then improve on said time afterwards.

"I notice there aren't many rules for Mercenary 100%, and so I wanted to check first. Is it merely a complete playthrough, without abusing glitches?"

Yeah, that is that category.

"If so, similar to my post in the MW2 forum, would a submission be okay as long as it is a recording of the game from start to finish, even if reloads are necessary for mission failures?"

Yes! That's perfectly fine. Obviously verification would be looking into whether or not you load into a different save, but it shouldn't be an issue. Good luck with your run~

The idea for Mercenary 100% was to run through all the campaign missions with no method or exploit to skip them.

All mission skipping methods should be illegal.

All movement exploits (power sliding) should be legal.

I did complete a run, I did not use power sliding though. Also played on medium difficulty.

I'd like to get some more interest in speedrunning MechWarrior games, to warrant categories such as glitchless and stuff.

probably should add that heat tracking should be on, unlimited ammo and invincibility should be off