Agreed the current TG application does some odd things.
Personally I find that I must set and confirm all parameters are correct before pressing TG START. If I change any of the parameters while running, the result is not what I would expect. If a parameter needs changing, one must STOP first, change the parameter, and then START again.
I believe sweep issues and ability to interact with the user interface while sweeping is going to be part of the new upcoming software release, so looking forward to trying when it is available!
Also agreed on the accuracy – it SA/TG44 agrees well with the much more expensive R&S ZVL I have access to, given the huge disparity in price point.