Hello,
The current released version, iceScrum R6, is quite difficult to setup and will be deprecated by iceScrum R7 in the upcoming months. The whole front-end and large parts of the backend have changed (in a good way) in iceScrum R7 so I would not recommend investing in iceScrum R6.
We currently focus on iceScrum R7 development and we don’t have the resources to facilitate and support community developments yet, and some parts are still subject to changes.
Anyway, thanks for your interest! Can you tell us about the additional features you would like to implement?