[lvalero]

Another possibility is that you could rule that technique is a Talent with levels.

This way you could say that if you dont have a minimum of, lets say, Talent Creo 4 then you cant create simple life. Or that the max time your creations lasts is your level of Talent Creo in minutes. It is a simple way to put hard limits on effects based on the talent.

In this approach the Talent technique is very simmilar as Magery (one collegue only) so the cost could be the same. You may also use Capping syntactic magic rule on Page 184 thaumatology

Another benefit is that for some very complicated spells you could rule that a minimun of a second or third talent is needed at a certain level.