+1 BUMP
The more I use this effect the more I like it - and what I like about it (apart from the excellent “musical” fade) is it’s pure simplicity with no parameters to consider or set: choose length of fade, select and go - job done. 
I would be loath to see this lovely simple tool get tangled up in a complex fade tool where fade-type/shape were selectable. But note that this does not preclude us also having a complex fade tool.
So just what do we need to do to get it incorporated into mainstream Audacity 
It would be good to strive to get it ready for 2.0.3 methinks …
Peter.