The Vandersteen website has some great info under the faq portion regarding biwiring. So does Audioquest. I recommend biwiring your speakers if the manufacturer has gone to the detail to develope a high quality crossover.
As for manufacturers jumpers, I recommend replacement. Using the same cable manufacturer and exact cable construction as your speaker wire. Additionally, Nordost’s website has examples of different jumper configurations.
Google - nordost jumper cables pdf -To split or not to split -
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As for manufacturers jumpers, I recommend replacement. Using the same cable manufacturer and exact cable construction as your speaker wire. Additionally, Nordost’s website has examples of different jumper configurations.
Google - nordost jumper cables pdf -To split or not to split -
N