For #1 - sure, you are more than welcome to remove the "update
profile" links from your campaigns. Do not try to remove the
unsubscribe links, though.
For #2 - more than likely you'll want to use the advanced list forms
since you can customize them however you'd like -
http://eepurl.com/fSNa
.
You can force people back onto a list if they unsubscribe, but you'll
need to be careful with that and your campaign segments to make sure
people who unsub don't continue to get emails they don't want and thus
report you for abuse.
jesse