I would think even if OpSpecs require an SIC for certain operations, you would legally only be allowed to log the SIC time in those specific conditions, because those are the only conditions in which an SIC is required.

I suppose for the purposes of people looking to get up to 135IFR mins, if you're going to fly 135 PIC for the same operation that you're doing PFT with, you're probably OK. However, if you're trying to use PFT time at some place like KeyLime with the intention of getting up to 135 mins for a different co., like Amflight or something, you're probably going to have a hard time explaining the SIC time in a Chieftan in an interview...

I'm not at Amflight, but I would think they'll turn their nose up at many of the countless furloughed 121 guys who are probably applying--many furloughed RJ FOs are going to be jet program grads with low PIC and spoiled by the Magic in the RJs....I would think a CFI with 1200 hours stands a better chance than a RJ FO with 2000 hours, where 1500 of those hours were gear monkey on an RJ