Hi jsmith000,
As jrouviere has very nicely explained in an simple yet understanding way, this is typically managed from the nodes due to the way LEM listens to the connection rather than polling it.
You may want to consider how you determine what should be synced, then base the way to connect and sync that node in, or find another way of separating all of these nodes the way you want. This means you'll either need to alter the nodes so only the ones you want are synced, or proceed to make numerous connections to sync specific nodes.
Additionally, there is always the last option which would be to purchase more licenses to withstand the synchronisation of all of the nodes without having to worry about how many and which ones you want.
-Midnight