Interesting.
Given FCEU's accuracy goal I'm surprised to hear there was an unsupported mapper still.
Personally I've never been a Nintendo fan. Not to say I dislike the machines, but pretty much everything they've released has something about it that I've disliked. Graphics for Nintendo systems for example,... Ive never really liked the look. NES is barely an upgrade from the Spectrum, and Snes only adds extra color and hardware tricks (obscenely low resolution graphics, even for its time). Then the N64 came along, and that looked worse than the Snes at times. Worst 3d image quality ever.
Some good games, but there's just something about Nintendo machines that's been consistent all along, and although I cant really articulate what that something is, I don't like it. Maybe it's the feel, maybe the look, .... whatever it is it's remained all along. Seems to polarise people though.
On a related note (albeit sidebar), I only just last night found out about the NES game "Sweet Home".
Essentially a precursor to the Resident Evil games. In fact it seems Resident Evil started life as a remake. Although there's differences, there's definitely enough similarities to show R.E's legacy.