I often find that I create a section when editing either a full page or breaking out from an adjacent section. It would be rather handy to have a /* blah */ section link automatically stuck into the summary in this case, as long as it's reasonably unambiguous.
Might be relatively easy as a side effect of doing processing for the navigable table of contents for the editor... :)
This card tracks a proposal from the 2015 Community Wishlist Survey: https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey
This proposal received 19 support votes, and was ranked #43 out of 107 proposals. https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey/Editing#Generate_automatic_summary_.2F.2A_blah_.2A.2F_when_I_manually_add_a_section_heading_when_editing