In an update of a previous post (vSphere Client on Linux) I was having trouble getting tsclient to except custom resolutions so I rewrote the launcher to execute the following:
rdesktop -u bfitzhugh -p -n virtualcenter.hostname.local -g 1680x995 -s 'c:\Program Files\VMware\Infrastructure\Virtual Infrastructure Client\Launcher\VpxClient.exe' -D
Launching the vSphere client using the rdesktop statement above allows me tweak the resolution to just the right dimensions and be able to maintain my top and bottom panels.