Speaking as someone who flies the CRJ for a living, albeit I've less than a years experience in the plane. It sounds like they have done what ever single airline who operates these little jets does, customize its capabilities according to their needs, wants and SOP. Regarding VNAV, its advisory only, the interface is actually inop. on our equipment. Which prohibits the A/P from following any VNAV commands the FMC gives it. We use the cue/symbology for simple route/enroute planning and visual reminders only. We still plot TOC and TOD the old fashion way, climb decent, crossing restrictions are all hand plotted and requires simple math on the part of the pilot to compute. We alos have ALOT of other restrictions as well. Such as GPS/RNAV approaches prohibited unless VMC and hand flown by the PIC.