I know it is possible to close the lock to make the find panel "follow" the currently active lister.
It would be nice having a tickmark to make it do the same when have 2 listers open, so the Find Panel with automatically populate its "Find In..." window with BOTH source & destination path.
Yeah, for people that are often comparing 2 folders, having a source & destination window open, so they don't have to manually insert the second window into the find field each time.
Perhaps a tiny checkmark ?