The reason why I have it set to be nominations and not volunteers is so that people need to have a pretty solid reason for nominating someone.
For instance, I could nominate you right now, based on the fact that you seem to be pretty level-headed and would be good at playing devil's-advocate. I won't nominate you, though, simply because I'm running the thing. If someone else would like to nominate you, based on those two opinions, it would be accepted.
People don't have to have a long, drawn out reason why. It just should be meaningful. Also, there is absolutely nothing stopping someone from asking another person to nominate them.
For instance, I could nominate you right now, based on the fact that you seem to be pretty level-headed and would be good at playing devil's-advocate. I won't nominate you, though, simply because I'm running the thing. If someone else would like to nominate you, based on those two opinions, it would be accepted.
People don't have to have a long, drawn out reason why. It just should be meaningful. Also, there is absolutely nothing stopping someone from asking another person to nominate them.