My guiding rule for lanyards is: use it, if it's useful. For SAK's and other multitools I have lanyards that clip into the keyring and clip onto a belt loop. When it's time to use them I pull the knife or tool out of my pocket with the lanyard then unclip it. The lanyard goes back on when I'm done. As far as permanent lanyards I'm not a big fan, with one exception, my flash light has a permanent lanyard that wraps double around my wrist. Sometimes when I am using a knife or tool over and over I will leave the lanyard on and clip the free end around my wrist. I made one paracord lanyard braided in a chain sinnet, (daisy chain), braided it's the right length to clip around my wrist. If I pull out the braid, (takes three seconds), It can be tied into a neck lanyard. I am considering modifying my set up to add a very small clip to my SAKs so that I can simply clip onto a paracord line rather than a proper lanyard.