Depends on what you mean on that, Of course you can have objects in your bsp maps. But you'll need a separate collision for those, and unless you're planning on either making your own importer for specific bsp types or rather the entity system, you won't get the objects from inside the bsp.
Easiest way would be to make your own editor that loads the bsp and then you could place the objects. It is possible to read the entity data from bsp to make corresponding stuff in DBpro too, just not very easy way to go.
Axes of Evil.
was made in DBC, plus it hardly has any mipmapping. Can't say it's the state of the art when it comes to gfx, but the models are nice. Also the game itself is pretty impressive.
Haven't tested the other games you mentioned, but it is possible to create nice lighting settings in DBc and DBpro too. DBpro now gives you full control over the object's specular, diffuse and ambient colors.. plus the specular strenght. So if you've got an eye for good gfx plus some patience to tweak around, you'll get good looking results.
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