Can I put a 40 hour driver examiner (master driver) course on my ERB? Is it worth promotion points?

If you're actually a SSG and you don't know that you don't get promotion points then you have a bigger problem than Master Driver. You need to go to the HRC Enlisted Promotion Page and read every single article about senior enlisted promotions they have posted there

Unless you are planning on being reduced in rank and therefor needing promotion points down the road or asking for one of your Soldiers what is the point of it? You may be able to get a couple credit hours for college when they evaluate your military training. But just like your other post about having UPL on your ERB, as an E-6 there is no real reason/advantage to doing so.

You can put nearly any training on an SRB as long as the S1 can find a code for it. I'd get that put on my SRB. Promotion points? What do you need promotion points for?