Allow users to add colors to the feature tree. Colors allow for a much more rapid search than names. Searching the names of features in a huge list is difficult when the tree gets long. The color could be added to the background of a feature line in a separate box or behind the text of the feature name. If it is possible to change the background then it may also be useful and/or necessary to change the font style also.
It is important to note that there should be 3 ideas pertaining to changing feature line colors:
The user should be able to edit the color of the block behind the text and font style of any feature in the tree
The user should be able to add a color block similar to the feature number in the tree
The user should be able to set up a color palette for each specific feature type, apply it, and then edit it independently if desired.