Hi Sebastian,
in our Productivity Tools Add-On bundle we also have a Table Actions add-on, which is still in beta phase. Apart from providing a context menu it can also be used for custom table action events.
Currently left-click, right-click and double click is working. These DOM events can be used to raise DS script events. In the coding you also can get the selection of the clicked cell. This could also be enhanced to enable mouse-over events. However, I am a bit reluctant to do this, as every DS event call also creates a round-trip currently (at least for non-HANA deployments).
Get in contact with me, if you would like to know more.
All the best
Jörg