This was a feature I didn't think much about when I selected it, but dang it's nifty to install a new bit after one breaking, hitting a button, and not having to pick a sacrificial spot to drop the spindle into to find 0. On my previous machine I could set the bit depth by lowering the spindle close to the material, loosening the bit so it dropped to touch, then tighten with the two wrenches. Problem on this larger collet is the lack of a second wrench, and the fact that I love the removable tool holder setup and I'd never go back!
Have you looked at getting it added on at this point? Couldn't be a difficult self installed part. Or at least it shouldn't be...