That is what I call hold your nose legal. You may not think it passes the smell test but if the manufacturer had it listed for 2 wires and the instructions say it is OK for 2 wires, it is OK. The only caveat is deep in the fine print it may say "2 of the same size wires". If you stick a #14 in a lug with a #2 there is a real good chance that #14 will not have a decent connection.
