I have a couple of requests/suggestions.

1. When I have multiple concurrent tasks, as configured in preferences, they usually are all querying the same search engine at once. I suggest, like if I have max 4 tasks, one could focus on google, one on yahoo, one on bing, etc. It should spread it out more, and be less likely to trigger google blocking.

2. In human emulation, I configure the delays between queries.
When I get a captcha request, could it immediately increase the delays between queries. A captcha requests is evidence we pushed too hard, so it makes sense to back off. Example, if I have 3-6 seconds, after a captcha, it increases it to 5-8 seconds, then 7-10 seconds etc.

Thanks for your consideration.