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[M Hotchen]

One thing I use often in vim is the ability to give a number before a
command to define how many times you want that command repeated (eg.
10j sends the cursor 10 lines ahead). I'd love to see this
incorporated in GMail.

So for example, typing 10j would send me 10 posts ahead, instead of
having to press j 10 times. Another example would be typing 3x, which
would would check the currently highlighted post, plus the 2 that
follow.