I love this feature of pgAdmin. Offering multiple join autocomplete suggestions would be great, but even just one suggestion that matches everything I might want to join on based on table FKs and column names would be fine. Deleting text is always faster than typing out all of the joins myself.

Example:
SELECT * FROM "LFSPos" lp
INNER JOIN "LFS" l ON l. --[NO AUTOCOMPLETE AFTER "l."]