Because you don't make sense when you speak.
A) Why does it matter if posts are made in these threads after both roleplayers have posted? I believe they're threads just like everything else on this board. One could easily come back and check out each roleplay if they wanted to read that certain roleplay, because it is obviously labeled with a date and the opponents they faced in the match. However, if they wanted to look back for a specific roleplay sometime later in the future, and had no idea where said roleplay was or who they faced, they would have to sift through the topics. That's pretty much the only time through which topics would have to be sifted. That's why each should have their own thread.
B) I'm pretty sure there's a mod feature, if not an admin feature, that allows for threads held within a certain forum to be organized by date and kept in place, regardless of whether or not someone posts in it. I know we've had it in the past and I've seen it on hundreds of boards. I would be shocked if your expensive software doesn't allow for such actions to be taken.
C) No. Firstly, you would have to wait for PMs. Secondly, everytime you further the conversation within a PM, the message is automatically encompassed within the confines of a quote box. Said quote box becomes increasingly smaller with each comment given. As the boxes become smaller, they become more narrow and the text shifts to a vertical stance, at which point the whole conversation is much harder to read.
Stop being so defensive and allow for some change. I mean, god, what the hell? I don't even want this to be PWA. I want this to be ACW. I just don't want the fed to be an absolute piece of crap where I have people that can't even spell "audience," beating me. It's ridiculous. Literally, the way you have things set up right now is hilarious. Some of your top guys have decent storylines, decent angles within their roleplays, atrocious grammar, and yet, they win. If you actually took the time to read my biography, you would see what my writing actually looks like as opposed to their's. You have no criteria, so they win. I'm actually trying to make things more fair for everyone, yet I'm constantly shot down with every single attempt. Literally, you take no value in anyone's opinions or ideas, except for maybe one or two here or there. I've yet to see those changes either. That's something that could be done instead of completely ignoring any logic presented before you, debating what little you absorb, and the telling me to shut up and roleplay. Oh, and I'm not the only one who thinks these things. Most of the people just don't have the balls to step up or just don't want to say anything at the moment.
And guess what? It's Friday, which means I'll be able to finally roleplay in the morning. Happy day! Time to crush Heath Venomous. How's that for kayfabe?
EDIT: By the way, there's also a feature which allows you to reorganize the threads within the forum in a vast number of ways, such as the time they were started, which means they could easily be reordered to find an RP.