Yes!
Please:
Complete control, when crew is boarding, when Pax are boarding and when cargo is loaded.
I find it (for my personal gameplay) highly unrealistic, that I sit in the cockpit and pilots are boarding. So I want to get rid of the crew at all. Best option would be to have the possibility to select crew pilots, crew stewards.
Then, cargo is started to load a lot earlier then pax. So best solution would be an option if one want the current boarding behaviour, or otherwise control all the steps crew pilots, crew stewards, cargo and pax individually.