Good evening.
I Know there exists several apps to detect updates of softwares like
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Sumo (already in Liberkey)
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Secunia PSI-
Update star (free or not version)
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Appupdateror, as you have noticed,
Ketarin.
It's possible use scripts to create automatic update scheme when new versions of apps are detected and downloaded them. Problems appears when there are some significant differences between the old and the new app's version for the portabilisation. It's why there exists volunteers for betatests like pango, mike007, reals1,... Thanks to them for their work.
As moderator I don't know all the steps and the scripts used by Dji and vagabond to create the lks, portabilize and published them on Liberkey' servers. I simply know that some tools have been specifically written to.
Outside Liberkey they have another work and they have a family life, too. I think it's mainly why the development and the update aren't always continuous. Big thanks to them for their work.
For me, I have always been voluntary in the project.
JP4U