For the people with poor imagination ;p

Here is a mockup with a combobox.

http://cyrille.diwi.org/tmp/krita/mockup-multiplier.png

I was also thinking of having button above the bar (this time use your imagination, no mockup coming :) ), but I thought it would take too much space, and here, you might think you lose horizontal space, on the other hand, you actually get an increase in resolution :)

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Cyrille Berger Skott