Good news! uFiling is now available
You can go to www.ufiling.gov.za to file UIF returns if you are a non-SARS paying employer (if you are registered for PAYE/UIF/SDL through SARS then use the SARS eFiling website.)
This should make registering domestic workers etc., filing returns, and making payments to the UIF a lot quicker and easier.
I messed up my registration, so I have to wait for them to fix that before I can use it