I think it is a good request. I hope that game control system could allow to bind keyboard keys to events to allow this. But when it turns out not, then maybe this can be done via control event finally.

Then there may be some fixed key constants for left and right Ctrl, Alt keys maybe even System keys. And then could be constants for remaining keys (to reach 32 bits) which one could dynamically bind to any keyboard input.

The only way to do this right now is with gestures. It's a silly hack, but I've managed to make a gesture set that passes keydown (sadly not keyup) events for my computer project. I think you might need a TPV to create gestures using arbitrary keys though, and they sometimes won't work if they're already bound to something else. Fortunately almost all non-modified keys can be passed through, so you can still type with a mostly full keyboard. However, that's a nasty workaround that I'd really like to avoid for several reasons. Some way to capture all keyboard input - even only while seated - would be fantastically useful, but even only a few keys would be nice for certain projects.

P373R. Are you familiar with the new game_control() scripting event?

This would also be helpful for vehicles, especially for air and space vehicles.

Check here: https://feedback.secondlife.com/combat-20