electrotype,
You can now configure to allow Pebble syntax during validation with the Webclipse 2016 CI 5. Please go to Help > Check for Updates and update to CI 5.
Go to Window > Preferences > JavaScript > Validation. Expand ‘JavaScript in HTML Options’ and set ‘Allow Pebble syntax’ to True. Perform the full validation to apply the changes.
You can also configure the ‘Allow Pebble syntax’ at project level. Right click on the project > Properties > JavaScript > Validation > check ‘Enable project specific settings’ and set ‘Allow Pebble syntax’ to True.
Hope this helps. Let us know how it works for you.
–Swapna
MyEclipse/Webclipse Support