make the iTerm window size a percentage of screen width rather than number of columns

Feature Request

Summary

would be super nice to have the ability to have iTerm take a certain percentage of the screen width rather than number of columns when using hotkey/visor mode. like for example when i'm on my MBA my setup is of course great, but when i have to use an external monitor at my shit client, then i would love for iTerm to take more screen estate rather than sticking to my 160 columns width. hope that makes sense!

Alternatives

the alternative is to use the mouse and extend the width of iTerm manually. BUT also most of the times it doesn't stick. once you hide and show iTerm again it goes back to the default number of columns one chose. the other alternative is to go set a new number of columns manually in your profile every time you connect to a new monitor. but i'd rather eat an apple laced with cyanide instead.

EDIT: made a mistake in the description above. iTerm DOES keep the new column number when the width is extended through the mouse. it does NOT when it's extended through third party window managers that use the AX to resize the window.

Concerns

absolutely no concern except that this may give some extra work to George.

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