For just foil stamping the foil transfer is great with a cylinder press as it literally irons the foil onto the sheet at roughly 1/16" at a time which all but eliminates the gassing effect that can sometimes present real problems when doing larger foiled solid areas.

The use of dwell is really more for embossing/deembossing as more time in the impression mode can be of benefit to getting a crisper finished image while for foil stamping all that's occuring is the transfer of the foil to the substrate and dwell really isn't all that helpful.

Though a converted cylinder press capable of doing foil stamping can do embossing since it has heat applied to the bed area the finest work in embossing is usually done on a platen style press.