I personally don't believe the 3000 has any special swing. It's all the same mathematics. Especially since Roger Linn himself said the same thing.
I don't believe it neither (although I do believe that MPC-60 & 3000 are inspiring machines, amazing piece of hardware.)
If anything, I guess its super precise MIDI triggering capability is that what made MPC-3000 and MPC-60 legendary machines. (the test results show that MPC-60 and MPC-3000 keep extremely precise MIDI timing.)
Also, this is often overlooked, the fact that they don't display waveform also contribute to "special swing." It makes users to use their ears, not eyes, to edit sounds. I love 2000XL, but I can tell you that often those waveforms can hinder to make good judgements.
96 ppq (parts per quarter note) is not much of resolution to begin with, also that's part of the reason why MPC feels like it has special swing. one tick makes big difference if you are serious about overall smoothness of sequencing (I'm no professional, but I can conform that) and with 96ppq, your sequences are always quantized in 96 ppq, which most of listener can detect it as "special swing". This is a reason why some of MPC users double up BPM to make it as 198 ppq (of course, 2 bar equals 1 bar on 96 ppq.)
I don't think time scratching is related with the original topic here. It has nothing to do with swing.