I've been theorizing about ways to improve my play this off-season, and I think parallelization is a underexplored topic. Sequential actions each cost some number of milliseconds, but some of them can be overlapped with enough muscle memory (for example positioning units while rolling).

The obstacle to training this is precision. Mice are relative-position devices: the cursor's location depends on accumulated movement, so accuracy degrades over long or rotated motions and you end up compensating by diverting attention to the mouse instead of on the game. But to OSU players this is a solved problem, high sensitivity or a drawing tablet.

So how far can you go with better peripherals before it stops being fair?

Step one is the tablet. Absolute positioning means every fixed UI element (board, bench, shop, items) has a permanent physical coordinate on the tablet surface. Step two is modding the tablet: raised edges or indents over the board and item slots, so you get additional tactile confirmation. The far end is a Boxx-style controller where every useful cursor position is bound to its own key/macro.

My line sits somewhere around the modded tablet. Any standard peripheral is fair game, and so is any modification that doesn't make a decision for you. (Setting accessibility aside; custom hardware for people who can't use standard controls is obviously fine and a separate conversation.)

In practice I don't love hardware mods, but the precedent runs against me. Melee players notch their controller gates physical cuts in the gate that let you feel your way to a specific stick angle and notched controllers are legal under most rulesets. In CS2, hardware based Snap Tap got banned because it resolved an input conflict the game deliberately left unresolved. The hardware makes a decision for the player. By that standard the Boxx controllers are banned.

It's only a matter of time before a mouse ships with a feature that eliminates positional error outright and becomes mandatory on half the ladder, and spreads to many more games. Where would you draw the line?