Add the ability to enable an auto responder:
Name: AutoResponderChat
description: enable / disable the ability to automatically reply to a message received with a message of your choice
Lists: Received and reply messages section for AutoResponder.

Obviously including various customizations: delays, random messages.
practical examples: I enter the server; a player writes "Hello CaptainGG"; tweakeroo automatically replies: "Hello everyone" or "Hello beautiful" with 1 message in a random way.
Furthermore, it would be cool to add the possibility to choose a key that, by pressing it, will send a message (with the possibility of selecting delays, random messages and various customizations)
example: I am about to die in lava; I click the button; send in chat "/ spawn"; I save myself.

There is a mod I use for commands called Command macros it is limited but works for simple /home like commands.

From what I understand from reading the description of that mod, it works via a configured key on the keyboard. I need a more automatic mechanism, which receives a certain message and responds with another. And then it would be better to have all these "mechanics" in one mod

I have a separate, chat related mod planned, so this type of stuff would likely happen in that mod, if anywhere. The features you described would need a fair amount of code and complexity for a "single feature" to add to Tweakeroo, so I don't think it belongs there. So I'll think about these when I have the time to work on that other mod again.