128th notes, dotted rhytms

I need 128th notes for Beethoven "Sonata pathetique". Could you implement these notes?

I find the way to input dotted rhythms very complicated. If you have e.g. many dotted 16th notes followed by 32th notes, you have to press many keys to change the rhythm for every note. Capella has a very elegant solution:
You choose e.g. 16th notes and then press ":" for dotted or ";" for double dotted rhythm. And then the program changes automatically between a longer (dotted) note and the shorter one. Would something like that be possible for MuseScore?

I like also the feature of the program Denemo to create a free (as long as you want to) rhythm and to use it afterwords for the following notes. This is very useful for peaces with often repeated rhytms.