[SpiralOcean]

LizPif's post was one workaround.

Create an action that blocks other actions from being shown until that action is completed.

-Project Power Wash house (sequential)
-- Rent Power Washer (start Jan 20, 2009)
-- Power Wash the house
--- Shut windows
--- turn electricity on
-- Return Power Washer

If other projects are waiting on the renting power washer, I usually create those items in a waiting for context.

-Project Power Wash Fish Tank (sequential)
-- waiting to rent power washer
-- power wash fish tank

The only trick with using this method is you must review waiting for items every day.