Ah right, yea. That's something I personally really really want to see and it's sad that the capability isn't there since it goes really well with the levels of customisation users have come to expect from this game. Now that we have something of an active group of devs on the forum it's something I'll look to push for but honestly I'm not holding out a whole lot of hope that we'll see it in the very near future (though I could be - and hope that I'm - wrong).
So yea for now we just have to suffice with texture design events.