Pushover API has recently added a TTL parameter to their RESTful API. As requested on Github, a fork for the implementation is here.
Holding off on turning this into a PR until it can be tested on v4 of the app, if anyone has access feel free to give this a try.
As a start, it does work on the desktop client 
Tested on v4 of Android App, submitted PR
Thanks - merged - released as v0.2.0
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