It's only with round core strings, which DR is the only brand that makes those as far as I know. So it's not only specific to DR, but more accurately, specific to the "Beam" products... HiBeam (SS), SunBeam (Nickel). The LoRiders, etc, are standard hex core and I don't think you need to worry about it on those.
Depends on some things, but if you've cut Beams before without crimping first and not "sprung" them, you've been lucky.
What you're talking about is totally unrelated... you're talking about perfecting the break angle of the string as it passes over the saddle... that's also good to do, but not doing so won't hurt the string.
FYI.
Yea, I know it's not related but wanted to throw it out there for clarity's sake.