Plenty of people do report requests, spam, swearing and flaming to us and we deal with it. In fact it's sometimes a race between us staff to get it done and reply that's it's been taken care of. There are too many posts being made to look at every single one and see if it's fine but we know others will look at it and hopefully these people will if they see a breach of the rules or something else not permitted, report it and thus one of us will take care of it.
Adding more Moderators is like the old "too many cooks spoil the broth", we'd have more staff sure but if like us they aren't looking at every new post either then it's still going to be missed.
As for the non-English speaking subject, if I do remember correctly we ask via the rules to actually post in correct English because it is not only easier to read for us native speakers but also foreigners learn English in the proper manner too so those who have some teaching and understanding in it will be able to interpret it a lot more effectively. As will online translators, think how many times you have used a translator and got a good result because those people are responding in their own language and then picture that same person doing the same to your gibberish, it's not really fair is it? Also txt and leet speak is not permitted, please do not do it, this isn't to be grammatical or improve language skills of the world it's for the above reasons, typing in correct English actually benefits those who do not speak it. As strange as that sounds it's completely true.
Of course those of non-English speaking are also required to provide a translation to English so that the topic can progress without many people scratching their heads wondering if the topic is still about X or is now about Penguins.
Back-seat moderation happens everywhere and for the most part it's helpful and actually relevant, what I hate ...no despise is people who Whack-Attack-Mod, you know the sort the ones who popup to say one thing that doesn't help, like Use the search or Noob and the usual favourite Wow mega bump and then hide again ready to spring up and spout nonsense at the next unweary member looking for an actual answer.
Please people don't be a Whack-Attack-Mod!!
Cheesy Pasta!!