Have you tried using simple HTML named anchors?  I'm just new to DNN, but in html you'd just drop the code: <a name="ModuleName"></a> into a text/html of the module you want to link to, then link to it from the links tool like: <a href="#ModuleName">Module Link Text</a>

I know this is a simple option, and may not work for the use you have, but if you're linking to a module which has the ability to add text to it, then it may work.

Cheers,

R.