Gmail has a good example of customizing the functionality of swipe actions, can we get that in RTM?

I use smart lists with the Getting Things Done system, but my next actions list is filtered to tasks with startDate before now. I don't actually use the due date too much for the filtering and much more common action I do is postponing the startDate (rather than the due date). I would love to be able to do that in one swipe rather than postpone.

I'm also open to any suggestions for my system if folks have ideas!