The video resolution can be changed for xorg.conf in the vm but your video driver has to be set to vga or qxl (I am not sure) the default is cirrus which only supports 1024x768
Virt-manager's vnc viewer can't share clipboard so if you use remmina instead you'll be able to share clipboard. For shared folder add a new hardware filesystem passthrough and you will have to change the ownership of the shared folder to user libvirt-qemu or group kvm on the vm you will have to run mount -t 9p -o trans=virtio,version=9p2000.L hostshare /mnt/ hostshare is the targetpath (not a existing path just use a name) For using spice you will have to use the tool virsh and edit the VM's configuration and change <emulator>/usr/bin/kvm</emulator> to <emulator>/usr/bin/kvm-spice</emulator>
