Very easy:
Quietly install a network printer – per user
rundll32 printui.dll,PrintUIEntry /q /in /n "\\machine\printer"
Quietly delete a named network printer – per user
rundll32 printui.dll,PrintUIEntry /q /dn /n "\\machine\printer"
Set default printer
rundll32 printui.dll,PrintUIEntry /y /n "\\machine\printer"
Quietly install a network printer – per machine
rundll32 printui.dll,PrintUIEntry /q /ga /n "\\machine\printer"
Quietly delete a network printer – per machine
rundll32 printui.dll,PrintUIEntry /q /gd /n "\\machine\printer"
Quietly delete a specific printer driver
rundll32 printui.dll,PrintUIEntry /q /dd /m "PrinterDriver"