Is there anything I can do to have these limits increased?
Getting whitelisted from theymos, If I'm not mistaken Iasenko was whitelisted like that while he was a full member, but for him the delay was longer, 4 seconds might not be much you can deal with it, 60 would be annoying with the amount of spam we're getting in some topics..
If I am not wrong the global moderators can whitelist an account too. So try with them too if you do not get response from theymos @PrimeNumber7
But like other said, 4 seconds is very little duration. And concern is if you are trying to catch up with it means you are trying to keep your hands busy like a robot. Wanting to continue with this pace with your human hands - you may end up breaking your keyboard :-D