You're the only one experiencing extra cpu usage so far though so it is probably an issue on your end. How much ram does your server have? And how much are you allocating to each client?
stealth quester on the sdn or there are some open source ones you can use.
or if you want a private script but that will cost you more.
Or if you plan on doing it by hand it takes 3 min of just turning in items.
How sure are you on that detail? I think medusa was able to create 100 accounts on a single ip within quick succession.
So I'm not sure what the limit per ip per x amount of time is in terms of creating accounts before getting blocked.
Osbot is still very active. You can gauge how well a script works from reading the script's thread or asking for a trial.
As for ban rates this site works:
http://www.osrsbanrates.com/
I will def be using it. So much easier to play in bed and if you go somewhere where you'll be bored for a few hours then you can just play way easier than bringing your laptop.
Is there a reason you tick the option on in the first place?
If you leave it off it will never be active on future clients and thus you won't have this problem.