Hey! I found one bit of room for improvement in the *changedAmt* extra data checker - the *Other* field isn't factoring in, I think because it's input type number, not radio.
So - I don't think it is working as described (we'll still get changedAmt for people who switch from a preset to Other) - looking at dsk sm control, for ex: https://en.wikipedia.org/wiki/NASA?banner=B1819_0701_mlWW_dsk_p2_sm_template&force=1&country=US