How to re-run Login Items?

Questions on MCX Policies for Laptop/Mobile Users regarding login items:

I have several managed Macs running Leopard. Many of them are MacBook laptops. My main MCX policies involve mapping printers and mounting network volumes at login. These are simple computer and group policies to help make the users life a little easier when it comes to finding and using network resources such as file server SMB volumes and network printers. Since most of my users are laptops, they are expressing 2 major concerns involving their laptops when they are off the LAN (i.e.; on the road at a cafe, working at home, staying at a hotel or when they have no network at all) The 2 topics below are the top 2 grips of my mobile users.

1) Most Mac users have a Cisco VPN client, and use it regularly to connect to the company's LAN from home, hotels etc. Of course when they log into the network via VPN, their network volumes are not mounted automatically. Is their a way to re-run the MCX managed login items script once they connect to the VPN and mount (i.e.; "map") their network drives? Sure, users can simple use the "Connect To Server" option in the FInder (or perhaps try and use the god-awful Leopard Finder sidebar discovery browser thingy which users hate), but I need a consistent automated way to mount volumes quickly and easily for my mobile users. There must be a way to run (or re-run) the login items part of my MCX policies manually.

2) When users are off our LAN, the Mac still tries to mount the network volumes in their OD/MCX login items when the user logs in (with cached mobile credentials). Can this be avoided? I need away for the users Macs to not try and connect to network shares that are stored as login items in their MCX policies. WOrks great when they are on the LAN, but is useless if they are off the LAN. They get tired of the "network volume cant be found" error.