Its been asked before and I can't seem to find any UDF or built in feature with support for Logging in AutoIt, but I thought it wouldn't hurt to ask and spark some focus on the matter.
Applications built for in house use to be run by those that develop them really isn't an issue. It becomes useful to troubleshoot an application if it utilizes some sort of Logging. It is feasible to write functions to support such a need, but I would be pleased if I could find someone who is a far better programmer than I had visited this so I don't have to divert attention and implement it into projects.