You list many DPIs as well as custom on the feature list, but the menu only shows the 50-600dpi in fixed intervals. Where is the custom DPI setting?
There are two ways you can use custom DPIs: 1) During installation, you can specify custom DPI resolutions for the printer. OR 2) After Zan Image Printer is installed, you can execute the gpd.dpi command provided by the command line utilities zvprtcfg and zvprtcfg_win32 to change the supported DPI resolutions for the printer.