StaticSpriteDatablocks?

#1 Yes, you can use t2dSceneObjectDatablocks exactly the same way you used the other datablocks before.
E.g.:

datablock t2dSceneObjectDatablock(exampleDatablock)
{
    class = "someClass";
    size = "16 16";

    imageMap = "someImageMapDatablock";
};


new t2dStaticSprite()
{
    sceneGraph = $YourSceneGraph;
    config = "exampleDatablock";
};

The imageMap field in the config datablock gets transferred just like any other fields.

#2 It's also worth mentioning that any given datablock can only be used for one specific object class. For example, if you define a t2dSceneObjectDatablock (which you might assume would be available to any scene object class) and then assign that datablock to a t2dStaticSprite even once, that specific datablock cannot be used for anything other than t2dStaticSprite's and will give you a console error if you try to later apply it to, for example, a t2dAnimatedSprite. This might seem limiting, but you can actually set a datablock to inherit from another datablock, so it really just comes down to organization.

Edit: THIS IS WRONG - READ MY LATER POST!

#3 Yeah, really? I didn't know that. I think it should be possible to have the same datablock for a static and an animated sprite - unless you don't use the class or superclass field (which will corrupt namespace linking).
I have no tried that though...

#4 My mistake, that applies only if you set a class in your datablock.

Edit: (or superclass)