> Maximum number of connections / Second
> 
> is nice, but very useless on dialup *wah*
> 
> I limit other mirror tools i've used
> to a maximum of 2 connections total.
> not per second, but never to exceed more than 2
> simultaneously.

I think the feature you are looking for is on the 'Flow 
Control' tab of WinHTTrack.

I also agree with your request for the ability to update 
the rate limiter settings live during a crawl.  That'd be 
something I'd also like to see.