Would it be possible to add a couple radio buttons to the front-end search so our users could change the result ordering to search by relevance or by date?
At the moment this is not possible. We are reworking currently the front-end options section, and adding soring features later on – so this is going to be available probably within a couple of months.
There is no exact date yet – first we need to successfully implement the completely new front-end builder system, then we should be able to add modules/features much faster.