bi-wire vs jumpers

Neither - shotgun is the absolute best way to go. It's not cheap, which is why it's not talked about alot but, if you have a system worthy - it will pay it's dividends.

Talk is cheap - I actually have done this on several systems, including my current one.

depends on various things and mainly on:

(1) the effect on your speakers (one size does NOT fit all)
(2) how far up the food chain are the speaker cables selected. The better the cable, the less favouritism toward bi-wiring. For example, on the CHORD website, CHORD is migrating away from 2 to 4 bi-wiring in favour of single runs with jumpers:

Bye Bye Bi-wire?

We have taken the decision to discontinue our range of dedicated bi-wire cables. The reason being, that in the vast majority of cases we believe that the best, and more importantly the most musical performance is obtained by using the best quality single wire speaker cable that falls within your budget, rather than a bi-wire cable of the same cost.

see website at www.chord.co.uk/products.php?pg=242

It depends on the system, I have heard it sound better bi-wired on one system and worse on another. One of those things you need to try yourself and assess.

Links to a couple of sites that had some discussion of the topic. I found both helpful. Do that copy & paste thing.

http://www.vandersteen.com/pages/Answr7.htm

http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/audio/biwire/Page1.html

Forget the jumpers. If your spkr has 4 posts & U don't want to bi-wire, just strip another inch off of the spkr wire and run the whole thing through Both terminals.