MPD is a MIDI controller only isn’t it? How does it do Swing? Very quick search shows something about Note-repeat Swing, so guess it can only apply when using the Note Repeatr function. Swing should be recorded into the Delay column, as long as you have this recording selected (but none of your other beats will be quantised then obviously, but you probably want that.)
You know that the MPC (so assumedly the MPD) pads are just like a MIDI keyboard, with the first pad starting at a note and each one after being a semi-tone higher? What you want is all drum-kit samples loaded in different sample slots of the instrument and then each sample assigned to a different note.
Renoise has a Generate Drumkit button that will do this for you automatically. Unfortunately it does not allow you to set base-note, always starting from C4, and I don’t believe anybody has made a decent script for easily setting this up yet (although could be wrong.) You should quite easily be able to change the MPD so Pad1 is C4 though, then the Generate Drumkit button would always create it with samples starting from your first pad. Bit of playing around to set up the MPD but make life a lot easier afterwards.
If I have mis-understood you or are teaching you to suck eggs (telling you what you know) then I apologise, could you expand further on what you mean.
There are limitations though. All drums will be recorded in the same Track. There is now a script that will spread these out for you though. There are no velocity layers, so you can not have multi-sampled drums. Hopefully this helps in some way though…
EDIT: To add - the above is all referencing to standard MIDI functionality, not to Duplex. Duplex is a different beast entirely, using the new Scripting features, and as such does not yet support true real time functionality so I think MIDI Note entry has been left out and as far as I understand recording of your knob twiddling isn’t supported. Both quite big flaws in my opinion and things I hope to see added soon (as its other MIDI features are loads better than the basic standard stuff.)