I do not have FSX I use P3D v4.3 which does not suffer memory issues as FSX does
So you fall into the first case, the one labeled as "which will slow down the sim a lot". And not just that, having to deal with all these objects, will disrupt Simconnect by sending too many commands at the same time (to keep the passengers locked to the bus), possibly causing issue to other addons too.
As I've said, it's done for a sound reason, and it won't be changed.