Hello Sylvain,
I have now added support in the XML for custom power-on/off sequences for the RTM. This works in the same way as for the front board, you just need to define the and entries under the key. Please let me know if this works for you.
Concerning the green LED, this may have to be implemented in the IPMC core code. Alternatively it may be possible to something with callback functions in the user code, but I need to look into this.
cheers,
Stefan