MSC2315: Allow users to select 'none' as an integration manager

proposals/2315-no-integration-manager-option.md

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+# MSC2315: Allow users to select "none" as an integration manager
+
+*Note*: This is part of a larger MSC for an integrations API:
+[MSC1956](https://github.com/matrix-org/matrix-doc/issues/1956).
+
+Currently if a client wants to offer the user to select no integration manager they are
+forced to use some vendor-prefixed (or similar) approach to store that information. While
+they could limit themselves to just detecting one level of integration managers, the UX
+for a such an approach would be lacking as all users would have to explicitly pick an
+integration manager instead of a default being applied for them.
+
+## Proposal
+
+It is proposed that a new account data event of `m.integrations` (`im.vector.integrations`
+during development/pre-spec period) be introduced to the spec under the Integrations API
+specification, when the time comes.
+
+The event content is as follows:
+```json
+{
+    "enabled": true
+}
+```
+
+Other flags may be added at a future time, however a single flag (`enabled`) is currently
+proposed. The `enabled` flag is a boolean which defaults to `true` when the flag is missing
+or the event not found in the user's account data. When the flag is `false`, clients should
+not render any integration managers (or integration manager features) to the user, even if
+some are defined by the user/homeserver/client config.