Quick cropping with GIMP, like in XV

I use XV for image editing, since 90% of time all I need to do is
quick crop and resize. XV has nice keyboard shortcuts.

The XV keys are: , and . to resize the picture, and mouse selection
and "c" to crop. 

So I can edit a picture in approximately one or two seconds by
pressing, for instance: ",,, <select rectangle with mouse> c Ctrl-S
ENTER ENTER ENTER". That's it.

It is very useful when I have to process a lot of pictures at once,
for example pictures of stuff to be sold on ebay.

I wanted to learn how I can quickly crop and resize an image with
GIMP. I do not want to use menus. I just want to really quickly get to
what I need using keyboard and mouse for area selection. 

What I want to avoid is using menus. 

So. How do I quickly crop and resize with GIMP using keyboard shortcuts?

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