I agree with Blesta Addons, I don´t know why blesta is taking so long to do something the community needs desperately. We know guys you are working on that, but we can´t wait years to have it done.
There's no way an addon package would submit information to a module's service from my experience. You need configurable options to manage stuff for the service. You can do addon packages but they will have to be added manually.
for me, the email history is not a trivial info that should be in the main page widget, only a link to the page in enough. but others might find it a so important info to make it in the main page.
is just a action from me, the main group company that has more than 50% shareholding is planning now to move to the other billing software as they have now importer for blesta and has the hosting solutions out of the box, but i didn't want to move and i want to push blesta team to make it .