Snapshots with embedded ROMs

Suppose I wanted to write a game that used a custom ROM image, rather like
/Shadow Of The Unicorn/ does. It would be nice to have a single snapshot
file containing the ROM and the rest of the game.

Looking at the .Z80 format, it seems to me that this should be able to
cope with embedded ROM images. A normal .Z80 file contains pages 8,4,5 (48k)
or 3,4,5,6,7,8,9,10 (128k). The spec allocates page 0 for the 48k ROM and
page 2 for the 128k editor ROM, so in theory it would just be a matter of
adding one or two pages to the .Z80 file and loading it.

I did a quick test (making a 48k snapshot and renumbering page 5 to 0) but
none of the emulators I tried (Z80 3.05, xzx 2.8.1 and FUSE 0.6.0.1) loaded
the result. Does anyone think it would be worth making emulators support
this feature, or should I forget about .Z80 and go straight to .SZX and its
ZXSTROM block?

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