After some time, I fixed an issue in j2Mantis for Joomla 1.6.
For download pleas contact us.
I installed a demo just with the LTS Version. You can test the module and play around:
The complete code can now be found on github:
I hope it will be easy to contribute more code. Maybe version 1.7 of Joomla will be skipped and the next goal will be support for Joomla 2.5. Hopefully we can share the cost of development.