What about using the preview and checking carefully your posts before submitting them?

When you post something erroneous someone will read it, and even if you update the node and fix it later, there is a good chance that some (most?) of your readers will never see the update. So try to respect them a little more and take your time before you answer, especially when you start a thread, as it is one of the most important thing you can do on PM (and as you should not be under the "first-answer gets more XP's" syndrom ;--).