I wish Virgil would listen.
If there's one developer who listens to the players of his games it's Virgil. He reads and considers everything written at the forums, but doesn't always reply, because that would mean the game will never be finished.
Bear in mind that the game needs to stay balanced, so many options have to be weighed. In addition to that the game shouldn't become too complex.
In my opinion repulsors already can create rather good pipes, especially when surrounded by terrain/shields. Furthermore anti-Creeper isn't that powerful, which means you shouldn't spend tons of energy for its infrastructure when you play the game well. And finally -as you've probably read in the topic about vacuming/bursting- you will soon see some nice functionality that will make you forget about pipes and sponges in an instant.