The idea here is that it would be very beneficial to allow general users to publish .YXZP packages to their server gallery (and/or the pubic gallery!!!). Currently, this can only be accomplished by a server administrator through the 'Admin' page on the server. It is also a completely different process than that of publishing Apps, Workflows, Macros etc., which can be done easily from the desktop designer.
For instance, I have developed an Adobe Analytics - Connector Toolkit, which is a .yxzp package, and is located HERE (check it out!). However, I do not have the ability to upload it to gallery.alteryx.com because I am obviously not an admin on the public gallery.
The neat thing about publishing packages to the server is that they appear just like Applications in the gallery. Descriptions can be added and you can even disable the default 'Run' button and provide a 'Download' or 'Save' button instead.
Hopefully, this is a feature that may be available in a future server release!
Regards.
Taylor Cox
P.S. - the Adobe Analytics - Connector Toolkit is also attached below.