Your thread "Low Time Instructors" is very pertinent in NZ, the requirements for a C cat instructor are as follows:
CPL(H)...(150hrs)
PinC 150hrs
Instructor training 25hrs
Instructional Techniques course
The IT course is required to be run by a teacher not a flight instructor and deals with the delivery of a lesson ie: whiteboard, OHP's, teaching aids etc...
There is no formalised requirement for ground instruction time but a candidate must be able to deliver any briefing that the testing officer specifies, (there are about 30 promulgated briefings).
There is definitely not the luxury of being able to pick and choose work down here even for a very experienced driver!...
So far I havent found any major advantage in having fixed wing and helo instructor ratings as most operators are one or the other.
Any benefit in having an FAA ATPL as opposed to multi I/F in the US or Canada?...