RotDS v2.9.8 download

The ROM itself had to be expanded to 8MB, but it will work the same as it was at 6MB as both are Ex Hi-ROM. One thing I noticed that's strange is 7E0000-7FFFFF seems to be a dead zone with 8MB ROM, nothing that I put there seems to work.

Yes, in Ex Hi-ROM, ROM offsets 7E0000–7FFFFF would be mapped to banks 7E and 7F, but in the SNES banks 7E and 7F are always mapped to RAM, so you can't access the full 8MB of ROM. However, the top halves of banks 00–3F mirror the top halves of banks 40–7F. So, you should be able to access offsets 7E8000–7EFFFF and 7F8000–7FFFF by looking in the top halves of banks 3E and 3F (that is, addresses 3E8000–3EFFF and 3F8000–3FFFFF).