TPO Multiselect + Opacity Adjustments

Please allow for a multiselect tool while holding some key and dragging in order to merge multiple TPO charts all in one go!

Would also be valuable to see which ones you merged and specifically un-merging some without all.

Similarly, need better tools for highlighting value area (within the letters themselves), the open/close markers need to be better, and adjusting opacities for various value/balance etc markers would be greatly appreciated.