Unfortunately the Tools > Footnote and Endnote (.uno:FootnoteDialog) command isnt contextually enabled/disable within the cursor is in the footnote and endnote area of a document, so we need such an uno command to be created for this scenario, so that it can be included in the context menu.
Gulsah Kose committed a patch related to this issue.
It has been pushed to "master":
tdf#103258 Add contextual edit footnote endnote command.
It will be available in 5.4.0.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.
Build ID: 0e0fef10002b46965edad02b3f460a502d9f6595
CPU Threads: 2; OS Version: Linux 3.19; UI Render: default; VCL: gtk2;
TinderBox: Linux-rpm_deb-x86_64@70-TDF, Branch:master, Time: 2017-02-09_01:24:57
Locale: en-US (en_US.UTF-8); Calc: group