The only way I have been able to do it is with the Actor Events. To do it, select the Actor of the unit you want to tint, then open up the Event - Events + property (or the Actor Event on the Event tab if your using the table view). Now you need to change the tint of the unit when it is created. So Right-Click > Add Event. Set the Msg Type to Unit Birth, and source name to the unit you are tinting. Leave the Sub Name as Any. Now set the action Msg Type to Set Tint Color and change the colour of the tint. The HDR Multiplier tends to give the unit a glow effect.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.