Lack of interest New Flag for Phrases + Templates



XenForo deletes the master phrases & master templates from an add-on while the add-on upgrade.

Several add-ons (xenporta for the blocks, navbar manager for the tabs,..) creates dynamic own phrases + templates.
This phrases + templates aren't allowed to be associated to the add-on, because they would be lost while the upgrade.
So most coders (including me) let the add-on empty for the new phrase/template.

That's working fine, BUT the phrases/templates won't be deleted if i delete the add-on.
My first idea was, to set a "non existing add-on (for example: ragtek_formmanager_custom" as addon_id in the database for them.
And while tge deinstallation, the uninstall method would delete all phrases + templates associated to this add-on.

BUT wouldn't it be better to handle this via xf?
What about creating a own field in the phrase + template table, which can be set to true for this elements, and which wouldn't be touched while the add-on upgrade?