Sublime Shortcuts at OS level

I love Sublime text as many other people do. I love its shortcuts.

But whenever I'm editing text somewhere else, I keep on wanting to do Ctrl+L to select the whole line, Ctrl+Shift+Down Arrow to move my text down etc.

I would love to have those shortcuts (multi-cursor would be even better, but step by step) at OS level, so I can use it everywhere.

Any chance I can achieve that? Or maybe it would be a great opportunity to start an open-source plugin. Any tip on the feasibility of this?

I'm under Linux, but I guess the question applies to any OS.