Disabling DDP Rate Limiter does not affect createDirectMessage

Description:

The createDirectMessage method needs to be called for a room to be created between two users.
https://docs.rocket.chat/api/realtime-api/method-calls/create-direct-message

In order to receive realtime messages from any user in the application, I need to call createDirectMessage for each user.

However, this is rate limited to 10x / minute:
https://github.com/RocketChat/Rocket.Chat/blob/develop/server/methods/createDirectMessage.js

The Administration section has the option to disable rate limiting for DDP methods, but this disabling does not affect createDirectMessage.

Steps to reproduce:

1. Go to Administration > Rate Limiter
2. Disable all DDP Rate Limiter options
3. Call createDirectMessage 11 times in a minute

Expected behavior:

I am able to call the createDirectMessage method 11 times in a minute.

No errors are received.

Actual behavior:

When I call createDirectMessage method more than 10x per minute, I received an error:

{"msg":"result","id":"ddp-15","error":{"isClientSafe":true,"error":"too-many-requests","reason":"Error, too many requests. Please slow down. You must wait 54 seconds before trying again.","details":{"timeToReset":53975},"message":"Error, too many requests. Please slow down. You must wait 54 seconds before trying again. [too-many-requests]","errorType":"Meteor.Error"}}

Server Setup Information:

• Version of Rocket.Chat Server: 2.4.11
• Operating System: Linux
• Number of Running Instances: 1
• NodeJS Version: v8.17.0
• MongoDB Version:3.6.14

Client Setup Information

• Desktop App or Browser Version: Google Chrome (latest)
• Operating System: MacOS

Start with server/methods/createDirectMessage.js and trace how its rate limiter is configured relative to the Administration > Rate Limiter DDP settings. Reproduce the issue by disabling all DDP rate-limit options and calling createDirectMessage 11 times within a minute; done means the eleventh call succeeds without a too-many-requests error.