Will it be possible to integrate the "Push In" into GSX? Would be a great new feature.
GSX doesn't support Push In, but this is surely a planned feature for a future version. We'll surely keep in mind but, we are working on something so big for GSX, that it will have to be postponed for the time being, more like the 2nd half of the year, when we'll go back to other core features that could be improved, like Pushback.
We balance our work on GSX between improving exiting features and adding entirely new ones. For example, last year we took Refueling, which was a bit negleted in old versions, and totally revamped. Now, we are working on an entirely new feature/s, which we are not ready to announce just yet but, after that, we'll go back and revisit the existing features again, and Pushback is surely a prime candidate for improvement.