Multiple Profile ~ XP

We have been using multiple profiles on our laptops since NT times. i.e. 1) 
Wireless 2) Wired 3) Modem

Basic purpose was to enhance security and ease of use for the end user.

I wanted to ask experts, what impact it makes if we create single profile and 
when user logs in XP will decide what type of connection is available. 
My main security concern apart from operability is: if we create a single 
profile, is it possible for a regular user to create bridge connection that 
makes the computer a routing device (intentionally or unintentionally). If 
possible can we restrict them through group policy.

Problem we are facing in multiple profile is during the patch deployment, end 
user has to physically re-login on the machine, otherwise it stuck on profile 
selection screen. Although we could have created an automated timer for default 
profile, however different users have different default.

I would appreciate any input.


Thanks

P.S: please let me know if I have posted this question in the wrong forum.