As I look across my pms, I'll sometimes want to add something onto my previous statement, and as such I will try to find the pm that the other person and I were using to speak to each other. However, I'll find it difficult, as the name of the pm isn't always enough to make it stand out. What I'm suggesting is that when there is only one other person in the pm, perhaps the other person's profile could show in the inbox?
I agree, that would be nice! The best that I can think to do with that now is to store your various conversations in sub-folders, but that can take a lot of clicks to get through each of them. I get the feeling that folders are better used for archived conversations than for active ones.
I third this!
Boring explanation
I get nostalgic a lot and tend to read through old PMs with great people I used to talk to, so this would be really helpful in finding specific chats. For context, I have 15 pages in my main inbox, plus 25 pages in a different folder haha.
Adding the ability to see who else is in a PM convo from the inbox is a planned improvement. 
Guess I didn't need to mention this then. Ah well, no harm done.
No problem at all! I'm glad to be able to give good news about it.
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