Template modifications are great (TMS).. but they ARE somewhat problematic to use as it appears that you have to have development mode enabled.. which to me is somewhat an oxymoron if so... especially in the cloud environment. I really don't see see why XF currently forces you to use development mode for TMS edits... it's not like it's much different than editing the actual templates in use. I personally see it as a "weakness" in the system, especially when it comes to their cloud offering. At least with the self-hosted you can change a few config.php
entries and enable it... but if I remember correctly (and I have slept SEVERAL times since then) in the v1.x version of XF it was enabled without doing such.