I have tested this on Jaunty and as far as I can see user setting the MTU 
within NM do get applied to the network interface. Even after disable and 
enable networking. NM version is 0.7~~svn20081018t105859`-0ubuntu1.
lsb_release -rd
Description:                  Ubuntu Jaunty (development branch)
Release:                       9.04

apt-cache policy network-manager
network-manager:
  Installed: 0.7~~svn20081018t105859-0ubuntu1
  Candidate: 0.7~~svn20081018t105859-0ubuntu1
  Version table:
 *** 0.7~~svn20081018t105859-0ubuntu1 0
        500 http://nl.archive.ubuntu.com jaunty/main Packages
        100 /var/lib/dpkg/status

What did I do:
1. Look at the MTU via "ifconfig eth0" which was 1500
2. Went to Network Connections->eth0->Edit and Customize MTU to 500
3. OK and Close
4. Disable Networking and then Enable Networking
5. Check if the MTU is still there within Network Connections->eth0->Edit
6. Check MTU with "ifconfig eth0"
 

** Attachment added: "Before MTU change"
   http://launchpadlibrarian.net/19618844/BeforeMTU.jpg

-- 
NM 0.7 Fails To Set Custom MTU
https://bugs.launchpad.net/bugs/258743
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