Why do you want to do this? Is it the irritation at typing "sudo" so
often? That bothers me too, so I use the "-s" option to sudo to get a
root shell. A bit dangerous, but no more than having a root account
that you can su to.

jbuchana@zaphod$ sudo -s
[sudo] password for jbuchana:
root@zaphod#

Much nicer than typing sudo until your fingers are nubs.

I might want to point out to any people without a lot of experience
that this is a bit dangerous, more so than having to think and type
"sudo" every time you need it, so be careful!