I'm well aware that changing the mnemonics for a CPU is highly controversial.I seem to be one of the few here that prefers the "native" mnemonics
But I really felt this was a special exception: the SPC700 is absolutely, unequivocally, a shameless 6502 clone. Just like the HuC6280, it adds a few new instructions on top of it. Unlike the HuC, it also reorders the opcode bytes -- but nobody is writing code in db statements, so who cares?
The native mnemonics were almost certainly a thinly veiled attempt to avoid licensing fees for the use of the 6502 instruction set. And in this case, they are truly gross mnemonics that force you to think about parameter ordering (src,dest vs dest,src) and leave tons of holes that are not obvious until you get assembler errors for missing opcodes.
I've emulated ~15 processors now in higan, and the only other time I've made up mnemonics were when opcodes were not documented and I had zero choice (uPD96050 and Cx4). So this was not a decision I made lightly.
That said, I understand and respect if you do not care for this. Sorry to inflict it upon you ... perhaps someone could write a translator so people can work with whichever set they prefer :)