[quote=@Captain Jordan]
Any system that uses the site to track and manage one's characters shouldn't mess with "switching" characters. Rather, one should simply select them at post time (and this is where linking a specific character to a specific RP would undoubtedly come in handy, to reduce the list of characters for those with massive casts). You may have meant this by your notion to switch between characters, but I've seen systems (and used them myself) where the implementation actually leads to linked forum accounts that are physically switched between (the forum logs you out of the master account and into the character account) at the click of a button. And it's messy. Keeping them separate from forum accounts would preserve sanity on all fronts.
[/quote]

I was more referring to a system where your account is set to a main "default" character, and you have the ability to change that, and it changes the character that posts every time. I've personally used a system in which you had to select a character every time you posted, and it was so tedious, it was painful. Many RPs use one character at a time, and my suggestion is that while you can switch the current character for one post, you can also switch the character that will post if none is selected. No alternate accounts needed; only a small expansion of the system you (and I suppose, though in different words, I) described.