is it possible to order tags case-insensitively?
I think this comes down to the LC_COLLATE setting. We don't allow users to directly modify their environment on Branchable for security reasons, but I can go in and set a particular environment value for your site if desired.
The inline directive does have a knob to control sorting, there's no an option there for case-insensative sorting but it should be easy to add one. If your tags are being displayed by an inline for some reason.