As far as I understand F-K-AF23, 35 and 36 are all want to help users to find free timeslots for events. This is done in korganizer in the conflict resolver.
My test so far:
* Create events with jane
* start john and create an event
* selects starts/end time within the incidence editor, so there is a conflict
* with jane as attendee
* using the "scedule..." button
-> automatic search displays the available timeslots for all attendees
-> visual search displays all fb informations in a not very nice gui
-> possibility to select only workdays
I see no fundamental issue with the conflic resolver so far.
Minor things:
* no "Verfügbarkeit anzeigen" for a single attendee only all in one within the conflic resolver
* no way to search only in working time
* if I select a timeslot in korganizer first and do not modify the datetime of the event within the incidenceeditor the automatic search won't work, because the datetime is not set.