I agree that it is extra work to have to click through two page refreshes just to get the source material that someone would really want to see.
Ideally the source link would have 2 components, one to open the Ancestry.com source information and the other to go to the off-site web page. I suppose an alternative would be to only have the link go to the off-site web page and require clicking into the event to view and edit the source details.
Regardless, I will pass the suggestion along to the product team members here working on that area of the site.
Ancestry.com Product team member