FW 3.1x has this built in, and it works with the m4 beautifully.
Actually, I should have known this...in fact I did know this

as I've had been running the Customer Firmware on a 6128 right from the start....
I even tried it on the M4 over the weekend, but because I have been testing and connecting across different CPC, have not settled on anything just yet.
Hmm, that's what happens after being off the Amstrads for a fair while. I should not have strayed
It's been so long, I still have BonnyDOS running on an X-mass on the CPC with the CFW.
Personally, I still think it would be neat as part of the M4 ROM to have a way of listing the ROMS.
Especially because it has a RSX's to add ROMs and disable ROMs, maybe sorta makes sense to also be able to list them.
But yes, I had forgotten about the other options (outside of Utopia)...so thanks for the refresher
Cheers guys.
Shane