Get a repeatable quest or series of quests that will have (based upon enough people doing this) an effect in a different alliance.
For example,
Daily spy/sabotage missions.
In a PVE setting I get to try to sabotage supplies going to my sworn enemy to help them rebuild their keeps in the Cyrodiil and if my alliance can out do the counter sabotage efforts (also ran by players in a PVE environment) then for the next x period of time we get a percentage bonus to attacking their keeps because of the sabotaged supplies that were delivered.