lol, now you are really showing your computer illiteracy.
Privacy? You are aware that this is the internet and that doesn't really exist, right? Even if it is private, like the diary section, that doesn't mean it can't or won't leak out. Quite simply, if you don't want people to see it, don't post it on open forum. Hell, depending on the topic, you should also be careful about posting it in private messages or in other places that you seem to think are oh so private.
Just give it up about the designs. **** is the way **** is. There's nothing wrong with this design. You get used to it if you aren't when you join the forum and there's not a whole lot you can do. MyBB has a simple design and trust me, sometimes simple is better.
Deleting things after a certain amount of time is not helpful or wanted by most people. Some topics, sure, but it's helpful and good to go back to older threads/posts. SkaFish just bumped a thread from 2011 today. With your idea, that thread would have been gone
Different rooms? Not even sure what you mean by that. There are different "rooms" on the forum. Games, General, New people, etc. As for contests, you could do that now, just post a thread and see if you get any takers.
We actually tried robots to ban spammers once. It ended up banning everyone...well, not everyone, but several people (including me) were banned an excessive amount and it gave the mods more work having to unban us all the time. Bots aren't everything and certainly aren't perfect.
For one being so up on tech, you should know that no one is going to print that **** out. Nor should they, because it defeats the point of a forum and being able to post on something that is valuable to certain members, like I exampled earlier of Ska bumping an older thread up. It happens all the time actually. Every year, several posts get necroposted because they are helpful and valuable.
Seriously, charge people to be members. You are aware that you will have no members if that's the case, right? And if you want to donate to charity, just go do it, there's no reason it has to be part of a forum.
Planned trips can and have been done in the networking section. That's what it's for.