[evirus]

which is more possable for a mod with more buildings then allowed on the interface's command list, an advanced building icon like the ones seen in age of empires 2, and starcraft

or a secound bulldozer (worker) unit that can only build the advanced buildings?

[Oldfaq]

second dozer, thats what World Crisis will be doing!
Oldfaq

[Tebrey]

i personally like the switched/expanded list idea. But whatever you like, go with it.

[warlord]

I would go with second dozer that can only be bought when you have a tech center.

[MetalSyren]

Personally I think a switchable expanded list is the way to go.