If they got the users table along with the static hash, it would be virtually impossible for them to brute force the passwords anyway.

Since I am using microtime as a dynamic salt, if they wanted to try and brute force the passwords they would have to try each possible value that microtime can produce.

delayedinsanity : It would not matter what the column was named. If they were smart enough to hack into the database I do not think a renamed hash column would confuse them.