Limit the maximum size that can be touched for 1 second.

[panda005]

Sometimes touching too much can bring system trouble. So I propose a function. This function limit the maximum touch size for 1 second with (-s).

[hoytech]

Interesting idea, thanks for the suggestion and pull-request. It's basically a rate-limit on how much memory should be touched per second right? I'll try to give the code a review soon, cheers!