Panda/pander merger. In my experience, it correlates strongly with non-rhoticity (So that's where the r went! They tacked it on at the end of the word!), but it's apparently not a perfect correlation, otherwise I'd propose merging it into the existing rhoticity setting.
The current non-rhotic setting does include pander as a rhyme for panda. To have this as a separate thing there could be either a separate panda/pander parameter, or one or two extra Rhoticity settings ('non-rhotic except for panda/pander', and 'rhotic except for panda/pander'.)
Once in a sandwich shop in Cambridge, Massachusetts, I heard a customer order a "lodge tuner." I suppose he wanted to tune his lodge. At Logan Airport in Boston one frequently hears overhead pages involving "Delter Aihlines."
Delter Aihlines is non-rhotic with an
intrusive R, and I suppose the same is true of 'lodge tuner' (with bonus father-bother merger) as well, though I'm not sure if it's called an intrusive R if there's nothing after it. I used to be amused by the 'alleluia ralleluia' while people were singing hymns in New Zealand.
I could perhaps add a setting for intrusive Rs, but I'm still trying to figure out what to do with the R that appears in the pronunciation of panda (or some other word ending in a vowel) when it is followed by an R word (which gives 'panda' two pronunciations, with the same rhymes all up but the rhoticity setting switched.)