Mark,
I see where you made the change in the rain rate gauge function in line 1559. I'm no expert, but it seems like the same change from 1 to 0.5 should also be made in the rain gauge function at line 1521 in order to change the scaling when more than 1/2 inch of rain (rather than 1 inch) has accumulated. In fact I've been just patching the gauges.js file using a value of 0.45 ever since our original discussion where you made the basic gauge scaling change to .5 as a starting point.
Let me know if I've got this wrong!
Rick