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I am sure that one of your current task statutes in labeled 'wait for the client', if not then just add it now...
I believe that you all agree that the client request feature tool (currently under the engagement tool) would be the best way to keep in contact with the client to inform about the information needed and keep reminders to the client to complete the required subtask.
Therefore I suggest adding the 'client request' feature as a tool under the subtask tool menu. I am sure that it would be a very powerful and useful tool.
If you feel that this feature would enhance Canopy and will much more organize your work or will speed up thinks, why not give you vote and let canopy know that this is what their customers needs.