In previous version, it has some components from the "PhoneGap". But it seems to be not the objective of DocBook XSL mobile. Using this package user can build mobile output and separately download PhoneGap package and replace with it's asserts at build time.
Current, mobile XSL is using cookies for store user setting in the apps.
But it seems those are not working properly on devices, even though those are working perfectly on Desktop browsers.
So, it should seek for another solution. Possible solution is HTML5 webstorage due to PhoneGap is supporting HTML5.
Should research on feasibility of using it and fixed the issue.