>Why don't the lactaid people just go ahead and make ice cream?<

They do.  It comes in  Double Chocolate; Vanilla; Vanilla Fudge; and Wild
Berry flavors.

Only one problem.  It's "not widely distributed," as they put it.  That may
be why it was pulled out of the Tampa area after test-marketing it there. 
It's here in the Rochester area, and my correspondents have spotted it
elsewhere.

All I can say is, go badger your local supermarket to try carrying it.

>Has anyone tried making ice cream out of Lactaid 100% milk and
Lactaid-treated cream?<

It should work exactly as non-treated milk works.

Steve Carper