RP Question

[Vitruvius]

So I've read the rules on the whole RP/making threads section and I understand the reasoning for like, not making a thread just to give yourself a boost before a battle or cheap and stupid things like that where you're abusing the system to make a current thread easier for whatever is happening at that moment. But what about when you're bored and you're in a thread and you're waiting on a reply (but you know that certain someone you're waiting on is also busy with life, work, running the site, being other characters and doing site work) and you just want to write?