For those that have asked, here is the current schematic for how I'm using 0.82 (default pin wirings).
I use the NTE3086 dual opto-coupler, you can of course use any OK you like, but I prefer it as it takes less room than two single OKs.
Note, the wiring really is that simple. For my test device, I'm running via MIDI (5pin, 180' DIN cable) cables to easydrivers. You would connect Mx_STP, Mx_DIR, GND, and M_SLP (if used) to the respective connectors for that driver. Note that M_SLP and GND are shared between all drivers (you can only make them all sleep, or not - I presume you'd add a switch to override at the driver if you'd rather it that way).