I hardly think it's necessary to start incorporating something like this for someone who, using puterfixer's example, spells mandatory 'manditory'.
Unless I have missed something, this is precisely
the reason for a spell checker.
Are you telling me you really think having a spell checker will improve the quality of people's typing?
Of course it will. If you are in doubt of this, please disable the spell checker in your word processor and see how well you get on.
A feasability study? I don't fancy surveying all of the mIRC users on every IRC network. However, I do believe polls can be created in this forum - but that's in the hands of the moderators.