Screen resolution for terminal session

[YesM]

Hello,

Through Plesk I navigate to Domains > domain.com > Files > Remote Desktop >
'Remote desktop terminal session'
Choose 'Screen resolution for terminal session'
I have 5 options, ranging 640x480 to 1600x1200

1/ Is there an administration panel, through Parallels (or Plesk, Remote Desktop) to change the parameters here? I want to give an option for 1280x800 if possible.

2/ If I connect to remote desktop through Virtuozzo Container, then the Remote Desktop link does not give a resolution option and opens in a small window something like 800x600. Is there a way to change this default size?

Thanks,
Andy