
Jason Holt |

I believe the phrase "as if she had cast X on herself" has been clarified previously to mean the actual effect of the spell (i.e. the spell description) and not the actual spell mechanics (school, components, casting time, range, duration, save, etc) unless otherwise specified in the item description. Otherwise, you run into various piecemeal approaches that contradict the actual rules in certain places.
For example, Wondrous Item activations state: "If the activation is on command or if no activation method is suggested either in the magic item description or by the nature of the item, assume that a command word is needed to activate it." Command words require a standard action (which the spell itself also requires). However, if the same spell required a full round action that would contradict the item creation rules and in turn be a piecemeal approach.
Boots of levitation therefore requires a conscious, standard action by the wearer to activate; but once activate, the duration is set to "continuous" (as there is no duration set in the description).
However, the item creation rules are actually guidelines. And like others have said, it's not unreasonable for the GM to put limitations on items that begin to hamper the game. I prefer to come up with other creative ways (rather than new rules) in order threaten intelligent or strategic players; but YMMV.