After weighing the pros and cons of making my own vs. having a custom one made including the cost, I decided to go the custom route with the footswitch cable integrated, 30 ft long. The company I went with is best-tronics.com. It actually will work out to be a little cheaper this way too. I worked with a guy named Jim throughout the quote process who was very helpful. I was concerned with signal loss like you mentioned, Pivot (especially with 30ft runs). But, the 1/4" cable they are going to use (CA-0446) has one of the lowest capacitance rating you can get at 20pF/ft. I don't know exactly what that means but I do know the lower the number the better as far as signal loss goes. There are tons of crappy off the shelf cables out there with a rating of 60 or more. here's a write up on the cable specs
http://www.best-tronics.com/guitar-cable/pdf/CA-0446.pdf. And here is a comparison to between two other highly reputable cable manufacturers, Canare and Mogami
http://best-tronics.com/guitar-cable/pdf/CA-0446Comparison.pdf. Also, it's made in the USA and it's always great to buy American, that is if you are an American of course, lol. Lifetime warranty too. I'll write up a little review once I get it......and NO, I am in no way affiliated with best-tronics. I'm just a dude in a band trying to make my gigging setups/tear downs quicker and easier
Cheers!