Starting in driver version 0.37 you can add up to 5 custom resolutions to the display via the Windows Registry. Each resolution definition must be added to the path below, with a number from 0-4. In case those folders and values are not there, create them manually yourself.
Each definition must contain 3 DWORD values, height, width and hz (frequency) of the resolution and demonstrated below.
Because registry DWORD values are hexadecimal, when adding each value it is helpful to select the radio button for "Decimal" so you can type the value normally.
In order to apply the resolution, you must disconnect and reconnect to the host with virtual displays enabled.
Parsec supports streaming resolutions up to 3840 pixels wide.