I've problem with my Macbook Pro (with El Captain installed on it) where one of the keys (such as r) doesn't work at all, so each time when I'm typing a word with "r", I've to keep pasting it from the system clipboard. It's very inconvenient.
I'm planning to see Genius Bar, but since then, I'd like to find a better way to deal with such problem.
I've also consider external keyboard, but it's another inconvenience, where you have to carry it physically with you.
Is there any way of rebinding a keyboard key into another one (like r into §)? Or do can you suggest something better?