Applying shortcut beam designations to multiple notes causes error.
Many shortcuts (e.g. shift-s for staccato) works when you select either groups of notes or ctrl-click multiple notes. I have created a shortcut for several beam properties (Beam Start for one). When I select more than one note in any manner I get the following error.
No Note or rest selected:
Please select a single note or rest and retry operation.
If I do the same thing and double click the icon in the palette it works as expected (as with staccato).
See discussion here: https://musescore.org/en/node/165636#comment-642776