1) Yes it is possible to have more then one skin, if you look at the bottom right next to the rss icon there is a link named "Change Theme" Just simply click on that.
2)Yes you can create your own custom BBcode, and it is easy to do.
3) You could look at using IPS's official addon, Ip.Content it well allow you to add pages with a few clicks, and it well be easy(ish) to move from Wordpress to IP.Content how ever there is no converter so you would have to Copy & Paste. Ip.Content is making leaps & Bounds for the next realse ( See about them in the Company Blogs )
I can't help you with your last question as i have never looked into it.
I am working on an app that's going to use IPB's Session's and Member's Id (just so i don't have to custom code it my self) it's not going to be an mod. What i would like to do is offer a free version (with ad's) and a paid version(with out ad's) I know IP.Neuxs can handle both of these elements (ad's and Paid member ships) How ever i would like to know how well they can integrate together along with an app. The forums well be at my.tld/forums/ and the app is at the root so you would go to my.tld. Anyways can Ip.Nexus be integrated with an app outside of the forums directory?
IF you need clarification as to what i mean go a head and ask.
i my self well be getting a macbook air for school in the next months. my HP is to heavy to Cary around with all my textbooks and binders. *I my self don`t find them over priced, i find PC`s much like everything now... to cheap but that`s JMO* I myself love the UI that OSX has. I currtley can not stand windows, but at current time the school only wants me to use Windows.
My first laptop was a very old (10 ish years) Macbook....
What do you mean? Do you have a hosted account with IPS? Or do you have self hosted? If you would like to change the domain that is on your self hosted account you should send a ticket in. If it is hosted i am not sure. You can only use the script (Ip.Board,IP.Content ect) on one domain at a time
It does not have limited features you just have to be willing to code! It is not a mess. But yes it is not well documented although there is some on it. The support i have gotten from IPS has been very good...
Ummm yall must have better ISP's then me... They use roundcube (the only part i like). The fact that i get little amount of storage... the fact that it is a .tv email? Nope i am going to stay with Gmail for personal email. And i also use my webmail for my domain names. That takes care of all i need :)
There IP.Converge that allows two(or more) forums that run IP.Board to connect, so the user olny needs one account in total. I think you would like for all the users from each forum to be able to talk on one? Ip. converge may work for what you need, Although i am not sure what you need.