Shane,
Great job adding the “extra entitlements…” feature, just when I started needing it! 
(I need it to re-add the com.apple.security.get-task-allow) entitlement to enable the JavaScriptCore Web Inspector to work in my released app, not just in Xcode)
I already have a “.entitlements” file in my project, and I’d wanted to select that when the dialog come up to selec the entitlements file - but it won’t accept that kind of extension, but only plist files, requiring me to create a copy (or symlink) of my original entitlements file.
Would you please enable selecting .entitlements extensions, too?
As always, your work is much appreciated. I also use App Wrapper, but SD Notary is easier to use for some of my needs. And free!