Hey, thanks for the suggestion! Both requests are relevant:
Custom answers in Plan Mode:
A similar request is already here: Add a "Custom Answer" option when choosing answers to clarifying questions
Comments in plan.md:
@Alex_Caceres, this has also already been suggested here: In-line Comments/Annotations in Plan Mode (a la Antigravity)
I’ll pass both requests to the product team. If you have specific use cases where the current UI feels especially limiting, please share them. It’ll help us prioritize.