Bad, bad, bad idea. Unless your users are happy with their reports being potentially inaccurate (have you asked them it 'mostly correct' is acceptable? Have you asked your manager if making the reports 'mostly accurate' is an acceptable fix?).

See - http://blogs.msdn.com/b/davidlean/archive/2009/04/06/sql-server-nolock-hint-other-poor-ideas.aspx

I think you need to have a read through chapter 6 (at least) of http://www.simple-talk.com/books/sql-books/troubleshooting-sql-server-a-guide-for-the-accidental-dba/