Depends on the capability of your script/bot. If it has an auto talker equipped to handle conversations then it won't matter. But if your on a quick chat world most people assume botting with quick chats because it is easy to program.
So would you rather not talk or talk with quick chat? Do a mixture of both..
Not really, because if u think about it theres really no need for a unmuted person to skill in a CC only world, especially since there are only like 3 meaning that most spots are already packed, with other botters at that..
Not a good idea.. Jagex looks for bots on Quick Chat worlds. Even if you have autotalker. They can find you out, even though it may be difficult for them.
As far as I know there's no quick chat responders for RSBot. Using a regular chat responder for normal world would be good enough. But only if your botting skills that doesn't gets you into a long conversation.