As Al said at the top of the last page, there is nothing better than a ratcheting crimper. We use one of those on all of our connections to motor controllers and motors. We do not solder those crimps to reinforce them, and we test them by having our electrical mentor tug on them.
As for the crimps going places such as the battery to the PD board or to the main breaker, our ratcheting crimper isn't big enough. We have a pair of very large crimpers (they resemble bolt cutters) that we use for battery crimps. We reinforce those with solder (which is then covered with shrink wrap).
I'll go a little off topic to talk abour PWM crimps. We've had a problem with our PWM crimps (inside the connectors) ripping out in the past. One of our newer electrical mentors showed our electrical team how to disassemble the existing PWM connectors, pull the crimps out, and how to solder them to reinforce them. After talking it over with the head electrical mentor, we decided to do something other than using the store-bought PWM cables. He bought 1000 feet of Red-Yellow-Black stranded 24 gauge (don't quote me on that; I'm pretty sure it's 24 though) wire. We cut multiple 2 foot and 3 foot lengths, and soldered the white Sidecar connectors onto one end in preparation for wiring. Then when we started wiring our electrical board, we cut the 2 and 3 foot pieces to custom lengths and added the black ends for Spikes, Talons, etc. (we used some of the 3 foot ones for things far away from the sidecar; most of the 2 foot ones were used on the electrical board). We hot glued the black ends into the motor controllers to ensure they didn't come out.
Here is a picture:
http://www.chiefdelphi.com/media/photos/38635