Hello @OS-den - Thank you for providing the code snippet for the AvalonEdit text zoom feature. It’s an easy win, as you mentioned, so we now have a PR that will land in Dynamo 2.17.
Python editor text zoom by Amoursol · Pull Request #13427 · DynamoDS/Dynamo · GitHub
Please note that this will not serialize the value to Dynamo right now as we are too close to release to correctly implement and test in time with the rest of our release tasks, but a future update can include a default font zoom also. In the interim, this PR will allow you to zoom on a per-Python-node-basis.