I've been thinking of all the crappy ways to connect speaker wires, and what I am going to do is retrofit my amps with the Neutrik Speakon sockets. They can accept the Speakon plugs, which are becoming the standard in pro audio gear, and still accept 1/4" phone plugs in the center.The same company makes XLR sockets that accept 2 cond or 3 cond 1/4 phone plugs as well as XLR. These people are thinking!
Next to these, "5 way binding posts", aren't bad. You can get jack plates that have room for both, one Neutrik Speakon socket, and a pair of posts.. which accept plain wire, spades, banana plugs, etc.