One feature I would like to see in this mod is that we could create vehicle groups. For example (right now i mostly play with TLM, because that has this feature but otherwise I would prefer IPT as it's a lot cleaner and updated faster), I use groups like this for buses:
- Small citybuses
- 12m citybuses
- 15m citybuses
- Articulated citybuses
etc

it would be nice if I can pre-create groups for all transportation types and when I create a line instead of assigning individual models every time I can assign one of the already existing line groups.