Yes, we plan to open up a bunch of configuration options as the network improves. Right now, we've got pretty strict limits on everything because if you start messing with the defaults you're at risk of making yourself incompatible with most hosts. For example, if you change the max duration in the host config, you'll likely exclude yourself from all renters. If you make the max price too low, you may not have enough hosts for the file upload to be reliable.
All this will be improved with time, we definitely plan on increasing the configurability (though, perhaps in an 'advanced' menu)