Two slight ideas (assuming they haven't already been considered), but if a 'holding' mechanic does become part of the game, it could be interesting for them to be more than a 'hiding' thing. Firstly, if the holding button was on the other side of the keyboard (like L for WASD) it'd kinda stimulate it being 'awkward' to do, kinda how it is in real life (ignoring the possibility for people to just rebind it or something lame). Secondly, given that being stinky/soggy is (I imagine most of the time) a detriment and makes you more obvious, the trade-off of holding it could mean moving slower -more so depending on how close you are to going- and/or being unable to interact with anything (because your hand/s are elsewhere). IDK if you even want a holding/desperation like system in this game, considering it is more-or-less about brain-drain and AB than anything omorashi. I'm just excited to see something like this, and it makes me want to suggest things (which I know is more unhelpful than not, I just can't help myself >:) ).
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Yep, no point inventing something new (or digging something up from the grave) when other mechanics are already there and have the opportunity to be played with and seen by other players. It's absolutely the best thing to do right now (at least by my stinky opinion), I'm just super excited about what could be to come and I can't help but gush about it.