I can't speak for everyone, but to tell you the truth that time will still end up in the total time column...and that will matter when it comes to meeting most of the regionals time requirements. So, it is good time regardless in that respect.

Now if it wasn't actually PIC time and you logged it like PIC time, let your conscience be your guide.

That majority of my time is from when I instructed in pipers and cessnas...it didn't work against me. Likewise, the majority of my sim partner's time is SIC DC-3 time. Also, another guy in my class, the majority of his time is military helicopter time...he got picked up too.