Hello sir,
First of all, welcome back to LoadUI!
And yes, you are correct in that the feature to style your graph-lines has been removed, it was removed in 2.5.0 and hasn't been on the roadmap since. Initially this was a prioritization-issue, more severe things had to be fixed before improving on the customizability of the charts.
Right now i dont think there are any current plans on bringing it back since there hasn't been that many complaints about it here on the forums. But i'm sure that if it gains enough attention here on the forums then it'll get reprioritized and ultimately included in a future release.
So i'm going to leave it up to the community.
Are there more people out there who sees it as a compelling feature to be able to style their charts?
Best regards,
Mikael
LoadUI Developer