After getting a support ticket response and double-checking the options available... MFL has no option for blocked kicks returned for a TD to count as points against (the opposing) Defense/Special Teams at all.
I asked for them to add this as manually adjusting a box score anytime this happens is not something a Commish should have to add to their league maintenance responsibilities!
As noted above, the kickin* team is not considered special teams. Otherwise fake punts/fgs for a td would be added to special teams tds, and they’re not.
The kicking team is (of course) considered special teams... but the outcome of a play determines whether they stay that way.
A kicked ball has to go past the line of scrimmage. When the ball is blocked, it reverts to being an offensive play.
It's silly but that's the NFL for you.