Insert, edit and create in-place
This kind of "ajax instant inserting/editing" mechanism is the way to go.
It could actually be just when selecting text a popover that shows the /logi_inserts/ dialogs. I would say the easy "mark and insert" will be a big improvement that will incite participation. Easy marking, in-place popovers with wizards (or tabs) should work to keep focus on the reading while inserting at the same time.
Same thing for editing, it could be done in place, for example, double clicking text would enable editing.
For the creation of contending logis, it could also be done in place, showing in the place of the contender the new blank logi, so it's already implicit that the tags are kept, and that it's placed to the bottom of the list of the contending logis for those tags.
If context is kept it is easier to understand the implications of your modifications.