Regarding the scissors, as I have carried several PST II's for 15 years, the only correction I have made is bending the clip to more of a right angle. The hammer, on the flat side, may also be the only option to tighten up the action.
The combination of the PT-510 and PST II makes for the perfect pocket multitool. Now if the blades just locked. I have some ideas on how to do that.
the scissors on my PST II are exactly the same, I've yet to actually do anything about it though.
I guess being in the UK locking isn’t that desirable, but it really bugs me when using a screwdriver and it closes on me when applying pressure. Having outboard tools is nice, but then you would sacrifice ergonomics of these tools when closed and opens them up to catch a lot of pocket lint. I however would like just the main blade to be outboard.
Sorry, pics are a problem for me at the minute - that's why it's so wordy
Got round to doing this as well, happily with a similar outcome.