Feature request: Upload to one site only

Testing an update can get a little scary when deployed in the real world and I just had a situation where I posted a bad update and somebody out there grabbed it during the 3 minutes it was live.

I thought about setting up 2 download sites eg http://mypublicsite.com and http://myprivatesite.com

Client would then look to both sites for updates but my website would be set up to only allow local connections to get to myprivatesite.com.Then if I post only to my privatesite then I know that nobody in the real world will get it

Problem is that if I set both sites up in " upload the Updates" there is no way to post the update to only one of the sites without manually disabling the other site.If we had a way to select the sites to upload to then this process would be less error prone

Thanks

Bill