The ability to add (a) new measure(s) to the end of the current section in the notation editor would be great. Behavior as to the effect on other staves could be user-chosen of, eg, push other staves later; insert extra measures on sections that end at the same time as the current one; or no effect (default).
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Added to Summer Code
http://rosegarden.wiki.sourceforge.net/SummerCode
The choice could also be done when the measure would be added.