I thought someone knows the code in the background of the toolbar. To optimize the design to a real -> flat design. (like the current UI in MS Office)
The original author has gone away. None of the current Lazarus developers know the code very well, or at least don't have enough time/motivation to make big changes to the component.
However if somebody (maybe you) want to study the code and improve it, patches will be accepted. Commit access for the Lazarus CCR repo can also be given for a person who wants to take over the maintenance of a component.
That is how open source works. Everybody scratches his own itch basically. There is always a lack of people who want to commit themselves to maintain existing code.
I remember fixing some bugs related to 64-bits etc. in this component.
Wp has changed it more. I don't even know the details.