The best feature of @UiThread that I only found when I was about to feature request & implement it. :)

https://github.com/excilys/androidannotations/wiki/WorkingWithThreads

It might be good to document that delay overrides the propagation parameter. It might even be a good idea to create an issue where the compilation of the class is aborted since they are mutually exclusive.

My suggestion:

Propagation

If you do not want to post the method on the UI Thread when the current Thread is the UI Thread. This can improve debugging and performance.

If combined with delay, propagation will be ignored.

Usage example:

    @UiThread(propagation = Propagation.REUSE)
    void runInSameThreadIfOnUiThread() {
    }