@Candacis~
No that is not possible but I will added it in for you.
@SpaceManFive~
First off thank you!
"I could also go for the ability to change the default background for the relationship window. Would this be possible, at least via replacing the background image in a game's files?"~
I'm not really sure what you are asking me here(That isn't he same thing that Candacis asked) but I'll give it a shot. Yes you can change the default background, that has been an option since this script was created. There is an option at the top of the script for that. What Candacis was actually asking for is the window backgrounds, I will be adding those in on the next update.
"Is it possible to rig up a relationship web, as opposed to a tree, with each character able to have their own tracked relationships?"~
Not really sure what you are asking here either. I don't know what you mean by a web or tree set up, unless you mean other party memebers, in that case not it is only set up to display one set of relationships but I can write a script for that. (It' won't be for free though. Just for warning)