f-edge can be used as a bump map but it's also a more general map. It paints a gradient (user defined width and color) on edges - either all edges, edges in a selection set or sharp edges based on smoothing groups. Sharp edges is the most interesting option since it can be used for masking to get a worn out edges effect etc.
I guess you could also extend the Corona Edges Texmap to support this.
It is NOT the same as AO in invert mode.
