Add options for "Append to current measure" and "Insert at beginning of score", for measures and frames
Currently, I can either insert measure(s) before current, or append to the end of the score. But composing is not a linear process, and often you already have the next section while still working on the previous one. That becomes a problem if the next section is in different time signature. If you insert a measure before the first of the next section, you have to duplicate the time signature of the original measure (it's moved to the inserted one) and then change it for the inserted measure. A better but still cumbersome way is inserting a measure before the last of the current section, then cutting and pasting the content of the original last measure (and the more staves you have, the less convenient it becomes).
Inserting measure(s) after current is as trivial and as common as inserting before current (I think, it is more common actually!), I'd like to have it as simple as well - an atomic operation with a keyboard shortcut.