[ChillerX]

Lower timeout will dc some legit steam clients. Just tested it few days ago.
Unless your server is dust2 only, standard or very light maps then is not recommended, especially if you have heavy new maps with many files (models/sounds) combined with high ping players.
But as i said anything bellow 30-40 can and will cause issues even for a local with low ping and potato pc. During my testing on various systems/isp i had 3 timeouts in 20 tries.
If the server picks up more regular players I can even set it to 1 and not care if few players drop because of slow systems.