Changing note values of selected multiple notes in one go

It would be handy to have a feature that can multiply or divide the length of selected notes simultaneously, especially to make them all half or 1/4th as long, or twice or 4 times as long.

You can do this with one note (by selecting it and then either hit a number-key or click a note value in the toolbar) but not with multiple notes simultaneously.

Relevance:
1. sometimes after writing a certain section of music, I decide later to use another rhythm for the section (for instance: from 2/4 to 4/4 or 2/2, or from 12/8 to 3/4) and when note values have to change because of that, you have to completely write the whole section over again. With a feature like this, this could be done in one click. This applies for both small sections (a few bars) or entire pieces.
2. Sometimes you have a last note of a phrase in some or all parts of a score, while the rest of the bar is filled with rests. When composing I often like to try different note lengths in these cases, but now I have to change these notes' length in each part individually.