Hello Pavel,
currently there is no option to show the displays in separate windows, but there may be in the future. One way to make the appear larger is to get a larger monitor and sit closer to it, that is what I do.
We won´t do the loading and fueling in the FMS, but there will be a new and improved GUI that will allow loading and fueling the plane to your heart´s content - I am working on that with Tom at the moment.
Cheers, Jan