The capitalization thing annoys me as well. If my Dom made me type in all lowercase, to show my status as a submissive, I'd go crazy. For it, it would probably be an effective punishment. One of my biggest pet peeves in the realm of the internet is those who do not type with proper grammar, capitalization and such. I've always been a skilled typist and not typing with proper things would be a challenge for me.

However, in this realm I am able to contain my annoyance due to the protocol that some deem correct out of respect for the 'status difference' between a Dom and a sub... do I agree with it? No. But if it makes you happy, then by all means do whatever pleases you. =) I do it a bit too, but certainly not to the extremes that some people take it, capitalizing Dom and lowercasing sub. It's a habit I've formed. =)