The cockpit view does not allow to see the fire switch gang plates easily. How can I have a better access to them?
Finding a satisfactory eyepoint and/or zoom that lets you see whatever you want simultaneously is just something you are going to have to make compromises with. If looking up using your hat switch isn't good enough, your best bet is to get a TrackIR. In addition to that, EZdok, will allow you to create and save custom eyepoints and use them with ease....especially useful for a plane like the Stratocruiser, since you have the Engineer and Navigator positions. I typically create a custom camera view for the Overhead panel, accesible with a keypress of '5'. Trust me, if you want to sim like a man, this is a must-have.
Besides, when I move one plate the switches don't move. How can I fix that?
Just tested it and they all work for me, all four of them. As you probably already know, but I'll point out anyway, it isn't a Right-Click operation, a la Pmdg, it is a Left-Click-and-drag-down operation.