Is there material on this disc that will help show if you have colour uniformity problems?
The 2nd edition does have a couple of uniformity patterns. Solid white field, black field, and then both with inverted squares in locations you should measure with a meter.
Can I do any grey-scale calibrating at all without a colour measuring tool?
You can set the basic user level control that has options like cool, warm, etc... To adjust the bias and gains you need a meter or at a minimum, a gray card with D65 reference light, which I would not recommend even trying.