About gamma, after checking your measure file, I must say there is no bug in the software
Anyway, visually, I can understand your gamma looks fine in dark scenes. But actually, it's a poor setting. The trouble is not in low IRE levels, but in high IRE levels. You have a huge clipping at 100 IRE, and even 90 IRE is clipped. Your contrast setting is too high.
There are at least three different ways to compute average gamma, and all can be discussed. We compute it by averaging values on the log gamma curve, with equal ponderation on all "gamma-able" levels (ie: all levels except 0 and 100). And every IRE level gamma is computed relatively to IRE 0 and IRE 100, the extrêmes. So, gamma values are coherent only when IRE levels 0 and 100 are correctly set. Without good references, even if the math formula is right, you cannot have any valueable result.
To see it concretely: check the "editable data" check box, and in XYZ units, change Y for IRE 100 from 84.573 to 101.5. Then, you will see a 2.22 gamma value. Clearly, your white is clipped, you must first solve this problem before setting gamma on your projector.
Well, I think you have the last beta: you can use special test pattern in the new Advanced menu to help you set your white level. Or use the near white grayscale measures.
About your wishlist: most of them will wait after next 1.2 release... Anyway, one is already available, since the very beginning:* Customizable RGB Levels line thickness(thinner) for easier visualization of level errors
You can open context menu with right mouse click and use graph settings to change colors, pen style and thickness of every curve, on any graphic. All those settings are saved in your .ini file.* Primary, Secondary colors continuous measures with reference values displayed for easy/fast calibration of color points
Well, that one may be included too, it's quite simple. I will check that
For your other wishes, it's general ergonomic improvement, not a few lines of code which can be included fastly in the latest hours before delivery