The SOG Powerlock comes with a quarter inch driver for standard sockets and with the optional quarter inch driver adapter can take bits as well. You can find these at Lowes for around $60.00 in the tools section.

On the subject of SOGs. Can you remove and add tools to them?
The Sock

For the leatherman, can't you just grind down normal hex bits to be rectangular or no?

For what its worth Hacksaw, I'll second the versadriver from countycomm....I have one and it positively rocks. I saw them years ago in the Dillon reloading mags my brother used to get. Back then it was called the "Doc Allen's versa tool". Then as fate would have it, 3 months later the local Cracker Barrel (resturant chain for those who don't have/know) started stocking them in their country store section. Got one for me and one for my brother. Picked up two bit carriers to round out the spectrum of things I could attack.
Works great and stores in its own little pouch. Highly recommended.

-Bill Liptak

You can grind them down. I believe D.R. did it, but it is time consuming and dangerous.

They will work in the Cybertool but don't have the spring ball to hold them in the socket.

I have a Versatool and really like it. I added a set of metric Allen bits (for the bike) and Torx 15, 20, and 25. I also have a set of cheap 1/4" sockets in a small bag that I carry with it sometimes, but they are too heavy to EDC. It actually is a very versatile tool. I still have a Leatherman in my every day bag, but the Versatool covers most of the bases when it comes to most screws.

The versatool is neat but isn't very convenient for my EDC needs...especially at work where I'm wearing a suit and don't/can't have anything on my belt (At work I put my Cybertool and Infinity Ultra on my key lanyard).

I have a small tool kit for use with my bicycle and I have a bit and socket set similar to the Versatool but I actually have a mini 1/4" wratchet in there...very handy. I also have a couple of the bicycle specific tools mentioned above...some of them are very compact but still solid.

I like the SOG Power Lock idea of the 1/4" socket and I've heard that the Leatherman adapter (the one that slips over the phillips driver) also works on Gerbers with square phillips drivers...unfortunately my Diesel is one of the few Gerbers to NOT have a square Phillips driver. I've decided that Leathermans are out. I tried a couple and the 'one hand opening' blades only seem to be so for righties and not lefties. I like the SOG Power Asssist. The assist works for both lefties and righties but the mechanism means fewer tools so no 1/4" driver and I'd be back to square one.

If the 4mm bits won't stay in, that certainly would be a pain. I think there might be ways around that especially if the driver arm in the Cybertool could be magnetized. Then it could also be used for picking up screws and what not...albeit weak. I'll have to see if it can be magnetized first...with Victorinox's penchant for stainless it's possible it won't be an option.

"...'one hand opening' blades only seem to be so for righties and not lefties..."

You got that right. I carry my Wave on the left hip (old habits die hard), and occasionally I need to hold something with my right while I get the tool and blade open with the left. Not impossible, but not easy either. Just goes to show that nothing is perfect...

Yes, they even come with a socket for takedown