What the hell is the point of playing multi if you can't even see your own rank? Just play solo at the same time and compare your scores or something.
Honestly, I usually hide the scoreboard too, and sometimes the rank in the corner is a bit distracting, but it's barely visible in the first place and you shouldn't even be noticing it if you're really concentrating. In fact, I value the fact that it remains unhidden so I can still see my rank without having the full flashy scoreboard going on at the left. If you want to maintain the current function and make it possible to hide the rank at the bottom, then that would call for an additional hotkey (and one more thing to press to hide everything), else if you want to completely override the current functionality, no.
Regardless, no support from me.