Add keyboard shortcut / hotkey for "Link Issue"

As a user I want a quick way to link issues without having to pull my hands from the keyboard, mouse over to a menu option and have to scroll through all the options to find "link issues." I want to be able to use a hotkey / keyboard shortcut to immediately access the functionality.

By comparison, I rarely if ever add a label, but I regularly link issue. Why would we have a hotkey for labels and not for links?