How to modify GitHub OAuth scopes requested?

[Mike Saavedra]

Our enterprise just switched from BitBucket to GitHub Enterprise (hosted). I have access to several orgs inside the enterprise. When attempting to add the GitHub account to SourceTree I have two options (GitHub and GitHub Enterprise) but only one, GitHub, allows me to use OAuth. When using OAuth and clicking 'refresh token', a browser tab opens (github already logged in and PAT already created) asking me if I want to add SourceTree as a trusted app. All is well so far, but in the list of orgs that I belong to, only one is checked (not the one I really need) and the rest have an 'authorize' button next to them. Clicking the 'authorize' button it tells me that I'm about to ask the owners for permission. Well, I take a look at all the permissions (scopes) that SourceTree is asking for and I know full well they'll never allow it. So, now to my question...

Why does SourceTree ask for so many (seemingly all) permissions/scopes from GitHub? Is there a way to modify the scopes being requested?