I'd like to either eliminate milestones or come up with a different mechanic for them for one simple reason: knowing me, I'll forget them. I did when I was running test sessions with the DDXP material a while back. I want something that'll be easier to remember. If it was something that happened after every encounter, then it wouldn't be such a big deal. But having to remember that a milestone is supposed to occur every second encounter is something that I know I will have a hard time remembering.