Ideally, I would like to set the sprint to which an issue should be assigned when creating the issue. Unfortunately, adding the Sprint field to a screen just gives you a plain textfield, in which -so it seems- a technical id can be filled out; a value that cannot be guessed by a regular user. So that does not seem to be an option.
Another option would be to have an issue be assigned to a certain (say "the last") sprint automatically when creating an issue. But that seems undoable as well.
Is any of this possible and if so, how?