You're over-thinking this...A lot.
Please, do not test the PSU for a week. If you do currently have a faulty PSU, there is a greater potential for you to do more harm to the other components by leaving in that faulty PSU.
Corsair (as well as the maker of the PSU, Channelwell) are well regarded companies that make good products. I understand your concern about wanting to test, but if the PSU is bad, it will almost immediately fail. The jumper method (Paperclip) is not meant to be used in a long term state. It is a quick way to fire up the PSU without connecting it to the Motherboard, or installing it into the case. The potential is there to do damage to a brand new PSU.
If you need to, you can also purchase something like this: http://www.newegg.com/Product/Product.aspx?Item=N82E16812189063
to add more fans, without using the 4 pin molex adapter.
And yes, if you do need to add additional drives down the road, you can use the Molex to Sata adapter.
You can place the excess cables anywhere you like, where they will fit. Try to keep them away from fans, and (if possible) the case sides, to eliminate noise/vibration. Use zip ties, or even twist ties to keep the cables out of the way.