Quackers gave a great guide to creating a custom mmc here - http://www.edugeek.net/forums/network-classroom-management/8430-teachers-resetting-pupil-passwords.html
1. Go to an XP Station and make sure the Server admin tools pack is installed.
2. click start, then run, and type mmc
3. File, Add Remove Snap in
4. Click Add
5. Select Active Directory Computers and Users
6. Click Add
7. Click OK
8. You will then have the normal Active Directory user/computer manager, go to the root OU where your pupils are stored.
9. Right Click on the OU and select new window from here
10. Close the other window from the root of the domain as we do not need that.
11. Click View then "New taskpad view"
12. Select Horazontal List as style
13. Click Next and Next again giving the view what ever names you want.
14. Do not run the next wizard.
15. Highlight a user account, then go Action, Edit Task Pad View, then click on the tasks tab.
16. Click NEW then menu command, and then select Reset Password on the right hand pane. Click next, give it an icon. Click Finish close the boxes. Now when you click a user you get the reset password icon appear.
17. Now just do a tidy up, get the view as you want it, click file options give it a name, icon for the console, save the console and create a shortcut to it on a shared drive and as along as the admin tools are install on the station it will work.
Sorry if i have missed a bit off, i'm rushed this morning.