I don't know that I've seen anyone mention doing this on any of the homebrew forums, but I find it very convenient. I keep my tank outside of my kegerator, and I added a "utility" line after my regulator so that I have access to co2 without opening the door. On the output of the regulator, I added a splitter, a couple check valves, and a ball valve on the utility line. The hose coming out the left goes inside the refrigerator, the one on the right is my utility line which is about 4 feet long. At the end of the utility line is a female air tool quick connect so I can easily switch between different tools.

Here's a pic of the different tools I have connectors on:

Clockwise starting from top: Beer gun co2 line (sometimes used to purge oxygen out of the the headspace of carboys, in addition to the intended use) Blow gun (various uses including blowing out hoses) Gas ball lock disconnect (carbonating outside the kegerator, keg-keg transfers, commercial carbonator cap) Tire chuck (diy carbonator cap) Carboy cap (sanitary siphon starting, transferring without gravity)