It adds mouse-over tooltips and/or icons to any TOC item, and can divide the TOC into sections with coloured backgrounds and headings.
It is suitable for use with TOCs from all H&M skins or none, except the Premium Pack Version 3 skins.
I'm happy to make it available to anyone interested -- some notes about using it and a download link are at:
http://85a.co.uk/toc_mods/toc_mods_ins.html
Please bear in mind that it was made for my own use, so it's scruffy, there is little idiot-proofing, and no bells or whistles.

But I'm finding it very useful.
Please bear in mind that it is not connected with H&M or EC Software in any way, so Tim can't provide any help or support whatsoever. I will try to answer here any questions arising.
cheers,
Martin.