I would say requests for research should be done in Server Chat and not in Bug forums (which already have a lot of reports).
That being said I did not find any evidence of a TL causing you to succor when gating. Not saying it wasn't a thing, I'll continue to run some searches.
All I found close to this was a way for Druids to Succor by not having their Velious tooth on them:
Druid Translocate!!
Basically, a druid can either destroy their tooth or bank it. If they port someone to Velious, the druid winds up in the safe zone of the zone their in while everyone else ports. Only caveat is they can't even sit or camp or cast, all they can do is either /q or run to a zone line to reset things.
I know this worked for a time with holding teeth on your cursor to succor, but I believe it was patched out on P99.