Good idea. Thanks for this suggestion.
I created a new Web Seed Request Limiter for version v3.11 which is now available. By default, it will only allow 4 connections to any particular web-seed host, but it is fully configurable.
You can find it in v3.11 in the Settings > Transfers > Peers near the bottom of the window.
See
https://support.tixati.com/web%20seed%20request%20limiter