Personally I haven't yet felt the need to get the lock to keep bits tight, as a small squeeze seems to go a long way, but there is a version of the powerpint with a corkscrew that has a lock lever as well. I bet it could be transplanted... I haven't tested it, but if you carried a zip-tie or some kind of tensioner that was adjusted to the right size, you could just slip it on from the bit end and push up while slightly flexing the arms. I imagine it would hold and do the same thing.
Anyways, here are the mods I've done so far and I'm still planning to add a chisel to the end of the file at some point (possibly with a Vic. Spirit style cutting corner as well).
1. thinned and smoothed out the can opener which now works really well not only for opening cans, but also for separating/prying
2. I thinned the cross driver for more reach
3. I made the bottle opener into a flathead
4. I modified the scissors so they open a lot more by cutting that back elbow part, sharpened them, bent them slightly for better cutting, and thinned the ends for more precision. They are still somewhat stiff but way better and now cut through paracord without issue
5. I angled the awl for better puncturing