My Opinion on this matter: (I'll weigh pros & Cons)
Topic: Limiting to one character per human player.
Pros:
1. RolePlay becomes more required and easier to do for your one character
Cons:
1. Inability to "choose" your means in any situation (IE your stuck with one ship nomatter what)
2. Inability to enact new ideas and keep your RP Progress of current character
3. Requirement to "start over" if you want to RP a different character.
4. Server population goes down due to lack of ability to have multiple characters.
5. Inability to Role Play multiple personalities.
Pros |--------------|-| Cons
The Pro/Con Metere says it all.
Side Note: About my signature, I can make a signature for you, you take the picture in-game or supply some pictures you want molded together to make a sig and I'll slap it together for your, the cost is 25 Million in game credits though.