Hi Vincent!
and most people don't really need one since they use the emulator from
the applications menu with the fs-uae-arcade or fs-uae-launcher
packages.
If you like to help, feel free to write a manpage yourself and send
it to upstream or attach it to this bug report.
It might be a good idea anyway to report this bug to upstream as this
isn't a Debian-specific problem but an upstream problem.
PS: There is no need to file two bug reports for this, really. I will
merge those bug reports and retitle accordingly.
Cheers,
Adrian