you can make a call to a hunt group, leave a message in a users voicemail box instead of the group box. the group can also turn on the mwlight to any user in the group which you desire.
for users wanting a mwlight for the group they are in. in the user, source number tab, add hxxxx entry where xxxx=the hunt group name.
to make a hunt group call leave a message in a user box. in vmpro, groups, add the group using the name of the group. in the pop up window select leave, click ok. then click the group name you just added. then click the leave item you just added in the specific start points area. click in the white area on the right side, select the goto action, add a leave mail action, in specific tab enter the vmbox number you want the message to be left in. connect the start point next action to the leave mail action.
in manager, you can enter a fallback entry for the group, and a button on a phone to activate the fallback. this will send the calls to the fallback group rather than the original group. add a group first with the users you want to have the calls go to when you activate the fallback function.
not sure exactly which of these might help, because your situation is not highly defined, but maybe you can use some of these in combination.