Double click should still edit footer and instrument name
Double clicking on footnote should open the Style > General > Header, Footer, Numbers dialog. Likewise double clicking an instrument name should open the Staff Properties dialog. It would be even better if the corresponding text within the dialog was automatically selected (to visually cue the user).
Discussion: Ideally footnotes in MuseScore would be directly editable in the score (similar to Microsoft Word, and all other text in MuseScore). Editing the text inside a separate window is one level of abstraction (away from WYSIWYG). However if double clicking a footnote or instrument name opens the text editing window, it becomes consistent with text editing of other texts and will significantly reduce the support burden when MuseScore 2.0 is released. We have already had a number people ask why they can't edit the copyright text anymore, even with the (typically advanced) users of the nightly builds.
MuseScore version: 2.0 trunk, r.5536 nightly build.
(Operating System: Windows 7)