I don't really like the fact that gxmame wants to
completely controll all options settings. This seems a
little over the top; it also causes problems like the
current brokenness with the -*hotrod stuff. Too many
version sync problems.
I think it would be useful to have an option which
allowed you to not bother setting global xmame options
at all, just use the system default instead.
I have a script which *effectively* does this by
pretending to be xmame and stripping out all the
arguments except those needed to fool gxmame (-version,
-help) and verify ROMs and such.
Even so, I think it would be a plus to keep the ability
to set per-game options.