From my NZ logbook (front page)
"Centre-line Thrust Aeroplanes: Time spent in centre-line thrust aeroplanes shall not count as multi-engined time."
I totally agree this is stupid - maybe it shouldn't count as multi-time towards a multi-rating (as you do need to be proficient in asymmetric operations) but in normal operations, the C337 has all the performance and complexity of other light twins.
Dupre.