i've never heard of that. the cream ales ive had use ale yeast. if some do use lager yeast, its probably a strain that can handle ale temps a bit better, the only one i know of that can do that, and is available to the homebrewer is san fran lager yeast. steam beers are the only beers i know of that use lager yeast at ale temps, therer are other sorts of hybrids, like kolsch or alt bier, but my advice to fudd would be to use the dry yeast at lager temps. my experience with plain ol' lager yeast at 64 degrees was something of a nightmare, i couldnt drink one.