Potentially the CURLing could be a better approach, since then you don't leave spare sessions hanging.

Fixes #586 (Github Issue)

This can be removed once turt2live/matrix-dimension#345 is resolved.

I am new to synapse. Thanks so much for these playbooks!

I wasn't sure how you actual activate dimensions after setting these variables. Should you re run 

ansible-playbook -i inventory/hosts setup.yml --tags=setup-all
ansible-playbook -i inventory/hosts setup.yml --tags=start

? If so perhaps you could tell the readers to do this somewhere in the help file

Thanks =]