I posted a bit ago about rounding my cables.....I actually cut the dma 33 cables one by one.......made a great improvement on my case temps.......
then came ATA 100 cables.....so I cut em up too. Bout every 4 wires........
Cutting 40 wire cables, you kinda have to cut em all the way.......cutting 80 wire cables, you can put a cut in them, but rip em the rest of the way. I've yet to get a bad rip. I now run RAID with ripped ribbons, and have yet to have a problem.
I also suggested cutting off the floppy cable above the first connection and 'swapping floppy drives' a long time ago.....I've been running with these setups for a very long time and have yet to have a problem.
So.........cut em up....if you cut to bare wire by accident.....insulate it with electrical tape to keep it from making contact with any other bare wires. If there are no other bare wires, don't bother. Tape isn't going to stop "cross talk" but neither is rounding going to cause it. As long as your wires are not touching anything........you're probably not going to have any problems.
I actually took the time this weekend to buy some loom to make the case look nice........power wires and all.......not any cooler but very professional looking since I did every wire in the case, right down to the CD Audio cables for my sound card.