> One produces single-architecture images (preferably bootable,
> which started this discussion), while the other is set up to
> produce multi-architecture images, some of the images bootable on
> multiple architectures,

Wrong.
distrib/cdrom/Makefile can also create any single-architecture image.

> and can currently not produce single-
> architecture images without local modification of files we keep
> in our CVS repository.

What is "local modification" you mean?

Anyway, you should share Makefiles which make image bootable
between src/etc and src/distrib/cdrom if you want to keep
iso target in src/etc.
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Izumi Tsutsui