Internet for normal users & /usr/local

[Hammurabi Mendes <hammurabi@persocom.com.br>]

I am doing some configuration now, and installing new programs, but I
would like not to desorganize the system or compromise the system
security, and I have 2 questions:

Is /usr/local the right place to put executables that are not controlled
by packages?

If some user is supposed to access internet, is secure add the user on
the "dip" group? (Or, was this group specially created for this
purpose?)


Thanks, 

   Hammurabi Mendes <hammurabi@persocom.com.br>