Better Pushback is simply the best pushback plugin for any sim. I would love to see something like that implemented in FSX/P3D.
Having to manually define Pushback, for each parking, if you never did a Pushback there before (which is how it seems to work, according to the video explanation), seems quite a bit of work but, of course, I can understand that, because it's way easier to program a Pushback if you always require the user to supply the info.
The hard thing to do, instead, is doing what GSX does: being able to figure out the path automatically in MOST of the cases, at every airport.
However, the interface to create the route is surely nice so, we'll take it into account when we'll allow users to define their own entirely custom Pushback nodes, which is surely something planned for a future version. That way, you'll have the best of both words: the convenience of GSX working 90% of the cases automatically without doing anything AND the ability to customize the special cases, like in that X-plane plugin.