Un-equal length speaker cable advice??

Depending on the aesthetic appeal (meaning allowed by your s.o. if any) you can instead of coiling lay the cable in a narrow half ellipse that leaves from behind the speaker to it's side and returns to it. You can "fix" the wire to the floor by a proper device i.e. blue tack or removable adhesive to follow the intended path. Got to get creative if a carpet is involved... Just an idea I've been using for some time with good results. Hope this helps!
Luis

Supposedly both of these companies can "tune"
cables of unequal lenghts in their network boxes to perform properly.
I use a pair of 10 foot and 20 foot Transparent Super
Bi-Wires with no issues whatsoever that i can tell.

Hope this helps!

It's a function of speaker impedence and cable electrical properties. If your speakers have a nice high impedence they'll be more resistant to asymmetrical cabling, especially if they're electrical characteristics (LCR) are low, like bigger Nordost, etc. If your speakers drop into the 2-3 ohm range anywhere then I'd be careful NOT to use high capacitance nor skinny cables in general, and especially asymmetrically.