This is a VERY bad idea as the shot will lock the lead onto the line, meaning the rig wouldn't be safe, so a fish could end up towing around a lead, which could end up in the death of a fish.
oh yes i forgot he uses a running rig i tri to use a lead clip when i can and if i cant i use a helli rig when .i use a running rig i just cast then clip on a korda flying back lead on the line .dont like running rigs much to much movement along your line .pluse i dont like when the lead hits the buffer bead i think it can get hairy at times