Hey Mathieu,
I looked into this and the request for this feature has been submitted to our R&D department and it looks like it will be implemented in future revisions of LabWindows/CVI. The ID# for the fix is 60954. When new versions are released they will have all of the fixes listed by these numbers in the release notes. The best workaround for this is still using multiple spaces to simulate tabbing.
Regards,
Lars