su command

i have an account on a server and have the root password. I gain root access by doing:
su - <pass>

in WinSCP, i log in with my account. but for all permissions i need to gain root access.
the command line is disabled for some reason.
how can i use the su command in WinSCP

please help
thanks in advance :)
FatRhino

Command line is enabled for SCP protocol only. But anyway, please read a F.A.Q.