1 - What are you talking about? Just add more vehicle spawn odfs
2 - Those are DOME objects. They are low poly models with low quality textures without collision so you can make it look like a massive battle without too much lag. They can be found in the space_templates/worlds/@#$ folder. You add them like you would add any other object.
The names for the ones in your pic are:
cis_cap_fedcoreship_dome
cis_cap_fedcruiser_dome
rep_cap_assaultship_dome
and I forget the name but there is one for the CIS frigates too.
And in BF1 Modtools, they also have Acclamators, Mon Cal cruisers, star destroyers, tie fighters, X-wings, and LAATs.
