GIMP, image resizing with keyboard

I have changed my video editing to GIMP for now and am learning the
ropes. 

There are some things that I like and some things that I need some
suggestions on.

Here's the list of the latter:

1) How can I change zoom to be 1:1 zoom, by means of keyboard or
command line switches

2) How do I change the actual image size by means of keyboard. For
example, in GIMP, I could press "<" and halve the size. Or I could
press "," and reduce the size by 10 percent. Is there some equivalent
keyboard command in GIMP. It would be hugely helpful, as I want to be
productive and don't want to get carpal tunnel from using too much
mouse.

thanks

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