I say yes, absolutely. In fact, StackExchange has a mechanism in place specifically to support self-answering of questions, while encouraging the user to accept other answers. You can answer your own question immediately after it's been posted, but you must wait 24 hours before you can accept that as the answer to the question. This gives time for others to post their own answers, which you may later decide are actually a better fit.
That said, I'm definitely against seeding the site, for the sake of seeding alone. Questions posted in this spirit would often be either too basic and therefore useless to the audience, or so specialized that the only one really interested would be the person who posted the question.
However, if you've encountered a real-world scenario where you and your group have come to a decision regarding a particular translation of rules, or if you've just found the answer to your own head-scratcher, by all means please do share!
Also, do be aware that while this site offers a great community of DMs and players who have broad and vast amounts of experiences with the game, Wizards of the Coast is often happy to answer rules-related questions themselves! They have their own community forums, and also offer support via phone, e-mail, and their own ticketing system. I've always found their support personnel to be polite, professional, well-spoken (I'm fairly certain the call center is in the U.S.) and knowledgeable. For what they don't know off the top of their head, the agents have the Compendium, a Knowledge Base, and books library on-hand for research. If all that fails, they'll let you know when it's time for a "DM's discretion" call and will even follow up if they later find a definitive answer!
Of course, this is by no means meant to dissuade you from using this website. I love the community here, but at the same time can't say enough good about my experiences with WotC's customer support. Please, if you do get an answer from them, come back here and share by posting your own Q&A entries!