A: Good news: you can already do this today, just under a different name. A prompt chain is exactly a sequence of messages sent one after another, and nothing says a chain has to be permanent.

So for your 5 or 6 one-off messages:

1. Create a new chain and drop your messages in as the steps, in order.
2. Run it. It sends them in sequence for you, which is the queue behavior you're after.
3. Delete the chain afterward if you don't want to keep it.

Treat it as a scratch chain: build it, fire it, throw it away. That gives you the ad-hoc queue you're describing without any separate feature - chaining is the tool for exactly this, whether the steps are saved prompts or one-off messages.

Hope that helps, and enjoy the extension.