maya-channel-box-plus
channel-box-plus will add search-ability over its attributes, and it will colour user defined attributes, making them easier to distinguish. With the threshold argument you can determine when to switch between colours, the higher the threshold the more the 2 attributes will have to match up to stay the same colour, this value can be adjusted using the colour settings that are added to the native channel box menu.
Installation
Extract the content of the .rar file anywhere on disk.
Drag the channel-box-plus.mel file in Maya to permanently install the script.
