It wasn't anything personal... 
The comparison was just to another "suite" of applications. And I'm not sure I agree with you. There are many actions that are similar. They are both, after all, image manipulation tools. One raster, one vector, sure, but that doesn't mean I don't want to center objects on each other. Similar actions should stick to similar key strokes.
I guess the real complaint is that I can't even customize Paint to act like that. There's no access to the specific alignment options within the customization dialog. All I can do is assign a hot key to the Align & Distribute dialog. (Which, always opens to a default of aligning something with the screen. 95% of the time, I'm aligning objects to each other. And I can't even tell Paint to keep the "To Active" guy as the default setting as opposed to the "To Document" option. So we just need finer control over the assignable actions, I guess.
I haven't gotten too far into customizing with macros, but I suppose I could assign something like "centering all selected to the active" to a macro, no? And then assign a keystroke to the macro?
J