We often get this question concerning various options available in vncviewer.
The solution is to save your settings into a .vnc file.
Once the viewer is run and connected with all your favorite options (Server HostName, password, Scaling, Color Depth, Encoding, DSM plugin and so on...):
Hit CTRL-ALT-F5, choose a name for your .vnc file, then save it, on your desktop, for instance.
(You can also right-click on the viewer's title bar then select "Save Connection info as")
Then, next time you want to connect to the same server using the same settings, simply double-click on your .VNC file.
You can of course create as many .vnc files as you need.