as far as I understand, starting from 1.2.1, jQM will support parameters in the hash part of the url natively (see the discussion in #5085).
However, it seems that parameters get stripped from the url when they're used in an anchor and, as a result, the url is not bookmarkable.
As @johnbender suggested, I'm opening another issue to address this problem.
Navigation: Preserves hash parameters so a page can be reloaded or
bookmarked. Fixes #5230 - Hash parameters get stripped from the url when
used in an anchor
Navigation: Preserves hash parameters so a page can be reloaded or bo…
Fixes #5230 - Hash parameters get stripped from the url when used in an
closing this issue the official stance has always been this is not supported and we have decided that as of 1.5 we will allow any valid id for embded pages this means ? is a valid character for an id so the params will stay in link however they will not be treated as query params they will be treated as part of the ID