Unit "Packs" (Buildable TeamTypes for a player, kinda)

So, I started thinking about trains again and I found this useful:
[UnitGroups] ;New section
1=PassangerTrain2x5 ;just a name of a group, in my case it's a passanger train with 2 locos and 5 cars

[PassangerTrain2x5]
Name= Passanger Train with 2 Locomotives and 5 Cars; A useless name, almost useless. For convenience and may be some new map edit which will support Ares' new stuff
UIName=Name:PT2X5 ;The display name of the group
Units=LOCOSTART,PASSTSTART,PASSTMID,PASSTMID,PASSTMID,PASSTEND,LOCOEND ;The units that will come there. The order defines what will exit the factory after what.
or
Infantry= ;the same as units= but for infantry. you can use only 1 of them
Connected=(bool) ;Are these units connected or no? If yes, then unit 0 will follow unit 1, 1 will follow 2, etc.
Infantry