I am also having the same issue in trying to do a fresh install on a new hard drive. I do know that in the past there have been similar probs in getting mouse and keyboard to work with these older MB's. I've done a search on those solutions and tried to work them into Clover but with no success yet. It's impossible to install OSX without any keyboard or mouse support.
I can get to the El Capitan install screen but cannot do anything else with no input capabilty. I've tried placing the DSTD for my MB downloaded from this website into EFI/CLOVER/ACPI/patched but doesn't make any difference. I tried using the DSTD from my Mavericks install to the same prior Clover directory and still no difference. I am stumped presently.
Tony, is there any way of choosing Legacy USB support in Unibeast like there use to be (I think)? I don't see any options for this. Can you lead me to the proper way of enabling USB Mouse & keyboard support on older MB's.
I am using a Gigabyte GA-P55M-UD2 with an older i5 750 CPU. Mavericks works awesome on this system, never did an update to Yosemite. I also use a MacBook Pro which obviously updated to El Capitan flawlessly...LOL.
Hoping someone has a solution.