Not sure what you mean if two DJ’s would have his own 2 channels to load and prepare,
Most of the gigs I encountered, most of the venue have its own in-house 4 channel mixer to hook up with, so 2 channel controllers its acceptable, maybe a different story if you like to mix and mash up songs live prolly need the extra 2 channels
For the drum pads part maybe later on you can add to your setup, something like Reloop Neon.
