cool, good to hear. with enough dedication and an eye for ui detail, i believe it is possible to make a custom-widget app feel like a good citizen -- the unity editor is a good example of this, imo. it's a ton of work tho!
(actually, i'm not sure if it's possible to make your app friendly to screen readers w/o using native widgets. maybe?)
if you do pull it off, you'll end up with a great ui toolkit for go. that would be a very interesting thing!
Non-native widgets can certainly be accessible with screen readers and other assistive technologies. But it's a lot of work. You'll need to implement the UI Automation provider API for Windows, AT-SPI for desktop Linux, and the Cocoa accessibility API for Mac. And you probably won't get any of them right the first time. So I think it would have been better not to create a custom toolkit.
(actually, i'm not sure if it's possible to make your app friendly to screen readers w/o using native widgets. maybe?)
if you do pull it off, you'll end up with a great ui toolkit for go. that would be a very interesting thing!