Donīt quite get ZOLTANS thinking. Do he really think that 250 hrs PIC is too much to ask for ATPL?
There seem to be also certain misunderstanding about what is PIC time and what is not. Flight instructor in C150 is Pilot in Command and co-pilot in F27 is not, period. Believe me, 1500 hrs instructor generally has much more mature attitude than copilot with same amount of hours on Beech 1900 when it comes for decision making.
Maybe that is one of the reasons for such requirement for ATPL licence.
Nikolai