Well, the port still has this in the pkg-message file:
NOTE that for USB cable you must comment out the line
device uhid # "Human Interface Devices"
In the past, I know I had conflicts with things like a USB mouse without commenting out the line.
As for converting the script to OpenRC, it's not that hard (search this forum for OpenRC stuff and there should be enough info to make you dangerous )
"Last power state" in the BIOS usually lets you do that, sometimes hidden under power saving options.