The plugin is only supposed to lock out players with < 30 minutes of playtime only if there are a certain number of players on. I don't think the plugin is broken but if the player count is not reached anyone can go CT without having 30+ minutes played. There's a thing called experience and one wouldn't be a good CT without it, adding a larger restriction just makes people lose interest more and never teaches them how to actually play CT; sure, they might have an idea of what to do but when you're on CT vs when you're watching the CTs is a totally different experience.
Also, rule reading shouldn't just be a "new player" thing as I constantly see people getting rules wrong then lashing out at other players, claiming they know the rules and saying "slay" repeatedly. I haven't seen much of people getting on just to blatantly rule-break and usually there are admins on to deal with the situations, in other cases it's just the lack of knowledge of the rules on the other part.