It doesn't happen often but when it does it's disheartening. You see you lane is mia, you go to type "mia" or "mid mia" or w/e and in that instant you get ganked. With your hands out of position, that 1 second differential can mean life or death.
While it may not be a long time to take you hands off the mouse to type, it is time and does take away from the flow of the game. Pings "can" be used but they have so many other meanings that merely pinging your lane will raise more questions than will answer in your team.
So I'm thinking it would be nice to have a MIA BUTTON. This could be hotkeyed just like the alert and retreat pings. Then, at the press of one button, a chat marker (or even better a teamwide announcement) would say mia for your lane so the rest of the team knows what's up.
This is especially useful for laning against champs like eve or kass that either disappear or leave their lane often.
Thoughts?
EDIT: To all the Nay Sayers....
I WIN!!!!! 
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TechnoMad
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