I'm making a small device that I want to power by the sata power connector/ATX PSU. It needs 5v and 12v power supply. This device will use standard 15pin SATA power male connector to get the power from the PSU. According to the specs I found here, there are 3 5v and 3 12v pins, some of them are longer and used for precharging. My question - is it ok in the device to shorten all 5v together to get more power, and also the same for 12v and ground? I suppose so because on all my PSUs there's just one wire comes to the SATA power connector for each voltage, but is it standard and stated somewhere in the specs?
Also, there are power disable and Staggered spinup/activity pins - can they just be ignored?