Since different games run at a variety of different resolutions and pixel aspect ratios, it's normal to have to tweak the monitor settings to get things to fit properly on the screen.
well, no actually. an arcade monitor is typically adjusted 2 or 3 times... in it's life.
i'm gonna tell you some stuff you aren't going to like to hear.
IRL, arcade monitors are put into a cabinet.. a game placed into said cabinet... the monitor adjusted... and... that's it. Literally. that's it. that is what it's designed to do for it's entire life.... there is no reason to change it unless you change out the game for a different one, or take that monitor out and put it into a different game.
arcade monitors aren't made to take constantly changing feeds going into it. same goes for tri res and digital monitors. people buy them and think "oh i'll be able to play standard, medium, and high res games and it'll change on the fly and work perfectly every time." except that's not what they where made to do. they are a fitzall monitor that will work on any one game at ONE resolution so you'd only have to stock 1 monitor and not 3 different ones. every time you change resolution, you need the change the pic settings...and it irks a lot of people that it's setup this way...but for us in the business. THAT'S what it needs to do. we don't try and run 10000 games at native resolution on the same cabinet... we do ONE.
buying arcade monitors and trying to make them do things they weren't designed to do is only encouraging breakdowns and only setting yourself up for failure and disappointment.
you need to hard set your resolution so it never changes, regardless of your game being played... and set your monitor up for that so it DOESN'T need to be changed at all. and if that means you need to squeeze or stretch your game to do that, you need to do that... not tweak the monitor every game.
if you want to try and extend the pot to the outside of the cabinet or whatever, by all means, have at'er. some K7000 chassis have the pots mounted to a remote board so it's absolutely possible.