Hi,
I'm a heavy user of the calibration grid. But the styles of the grips bother me a lot, because they often hides my calibration marks on the track. After some digging in the code and reading this thread https://www.kinovea.org/en/forum/viewtopic.php?id=1073 I was able to change the ellipse of the handles to a crosshair. In addition, I have marked the origin (this is always D?) of the calibration grid with a circle, since the running direction plays a role in my analysis.
Are you interested in the code and should I send a pull request?
After more digging, I also found the xml files for the drawingtools styles. Is it easy to add more options there or does the kva format/version have to be changed as well?
Greeting,
Christian