What BoingBoss has suggested is fascinating.
I've never seen a Mini-CDR but I have seen the recordable flipcards
(which are basically a credit card that spins around in your CD
drive).
I don't get why you don't want to put them onto hard disk instead of
on seperate CDs, but I can see the advantage of being able to take a
disc around to a friend's house (like you'd do with a console disc).
Another thing you might find interesting - MakeCD has an option menu
solely regarding CD32 & CDTV auto-booting. It allows you to make the
CDs bootable and add copyright notices etc. You might want to try this
if your disc is to be compatible with a CD32/CDTV.
For the Amiga 1200 bare in mind that a lot of CD-ROM adaptors won't
autoboot a disc because the drivers are loaded from the hard disk. I
think Squirrel allowed autobooting but I can't seem to do it on my
SCSI-IV kit.
Maybe an IDE/ATAPI CD-ROM drive would work best? Not sure...
Another thing you might consider is putting your games onto a Compact
Flash card or two, and having a portable PCMCIA card reader. this way
you can take the reader to a friend's house and a collection of
postage stamp sized disks (2mb up to 512mb!) and they can not only be
re-written to but are 10's of times faster.
:-)