you always have a message if you want to solve a ticket with active task

Yes you can clone a profile by using Behaviors plugin

in /tools, you have cleanhistory.php to plan clean of the log in a cron

it's a big jo to put export PDF directly in GLPI. You must review all creation form

done https://github.com/glpi-project/glpi/issues/433

GLPI don't change disable to enable for existing notifications during migration.

I don't know for FusionInventory

This comportment was ask by users.

explanation done: when a new object appeared in glpi, it is always tested before open to the users. And during test, the administrator always forget to active notification.

But if all of actual users want to change this comportment we can study this for next major version

Will be done before new year