Many thanks to everybody for all comments!
Yes, excrab is right - we operate RA390 (no APU) and HS125, no GPU unless required by AFM, usually short legs, nervous passengers counting minutes. Normally we start No. 2 when passengers approaching, nothing bad if it is done by FO / PF.
Just there was a proposal in the company to change starting procedures to "Boeing style" what seems to me unnecessary and not very logical taking into account our specifics.
Thanks for support!