Route tracking on the switches.
This is a very handy feature, and I would love to see it on the MS line of switches.
I would also like to be able to use AD authentication on the MX when the MX does not have the user VLAN as a directly connected route.
My MX has static routes to a layer 3 switch. The user vlan's are on that L3 switch, because of this setup I am unable to use AD authentication, which is very disappointing.