> How do you reduce boot countdown?

what do you mean by this exactly?

maybe you want to change a value of the boot manager? if so, 'man 
installboot' gives you:

-o options  Machine specific installboot options, comma separated.

                  Supported options are (with the machines for they are 
valid
                  in brackets):

(...bla...)

  timeout=<seconds>
                                  [i386] Set the timeout before the 
automatic
                                  boot begins to the given number of 
seconds.


> How can a user 'su' without knowing the root password?

sudo (see /pkgsrc/security/sudo) implements this if you like to; you 
have to enable this using 'visudo' (thus editing sudo's config file):

# Uncomment to allow people in group wheel to run all commands
%wheel  ALL=(ALL)       ALL

# Same thing without a password
# %wheel        ALL=(ALL)       NOPASSWD: ALL

the user has to be member of the group 'wheel' (as stated in the config 
file).

> end
>
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HTH,

timo