From what I can see on reference photos, the 146 and RJ should both share the same centre pillar design on the windshield, and that is reflected in our 146 and RJ products. I can see there is a slight taper on both real aircraft, so I've logged that on our internal trackers as something to possibly look into adding in the future.
We intentionally added the current type of weather radar to the RJ, as that was the only weather radar we had available to us at the time of release. We do have a feature request logged on our internal tracker to model an additional type of weather radar, but nothing is planned at the moment.
Mark - Just Flight