annotation trouble

I'd like to annotate some code with my annotations and the existing plugins do not fulfill my requirements. I'd like to:

- paint the annotated code with a different color,

- make a popup (like balloon help) when hovering over the annotated code.

How to hack these features into vim? Would I need to fork vim and hack some code into it? Maybe using vim itself as a plugin editor in my application would do the trick?

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