I can't really offer any info about the group chat, I'm too much of a loner and non-joiner to be able to test it but I can help out with the Partner info.
-Open the Robust db with an editor (such as Query Browser) and go the database.
-The path is db/userprofile/profilePartner.
-In the profilePartner field (of the avatar that you want to show the partner) it should currently list a zeroed out place holder for a UUID key.
-Replace the zeroed key with the UUID of the desired avatar.
-Repeat the process with the "partnered" avatar (optional, but usually both partners want it to show lol).
-Same as Grid except the db is the only db, so go there.
Note- I haven't tried it in standalone mode to verify it will work and show. I don't see why it wouldn't, but it is OpenSim and there are differences between the two, so without doing the acid test myself, I can't verify it. Grid mode, I did verify.