Looking at you're ideas around "Replicated Keys & Values, non-replicated Locks" [1]: acquiring a single lock, disregarding of numOwners, is covered in 2(non transactional) and 4(transactional): both suggest an approach for acquiring lock on a single node to avoid deadlocks. 4 also suggest an approach to fail-over the lock to the new owner. 

The eager locking is not handled indeed, but single node lock acquisition for eager locking is already available: http://community.jboss.org/wiki/LockingAndConcurrency#Locking_a_single_remote_node

Can you please take a look and let me know if there are aspects of 5 that are not covered by 2&4? 

Cheers,

Mircea

[1] http://community.jboss.org/wiki/PossibleLockingImprovements