I think it would be useful for the left side bar items revert to their last used configuration. For example every time I open nistune the first thing I do is minimize Scalers, Limit tables and Timing tables. This allows me to see all the other items that I more frequently access. But if every group I minimize stays that way the next time I open nistune well, it would be a nice to have.
Being able to move the split between the two bars would go really well with this too!
Also would be nice if the left side bar was resize able. Once upon a time I think it was a perfect size but I think it got wider when some table names got longer. and I'd be ok with some of the names getting cut off by re-sizing as the tool tip can guide me if two have similar beginnings like the two "Knock Timing Beta Advance" tables. Ultimately resizing would allow more real estate for maps and tables without them covering the bar or getting covered by the bar.
This one applies when Fahrenheit and MPH is selected in the configuration settings. The lower left side bar items like Warmup timing temp, O2 Feedback temp and Speed limits are only Celsius and KPH. (even though it says MPH next to the text box)
Imagine my initial confusion when had speed limit set to "120" and I could not accelerate over 75mph hahaha!
I totally thought something was wrong, downshifted and hit the same limit with more torque and RPM 
then I realized what was going on .Be nice for each maps and table but especially would want it for gauges: right click option "always on top" this would be AMAZING!!!