Those options are disabled because our normal mechanism of finding workspace/project files does not work in Eclipse as it does in SlickEdit.
If you save the attached version of tbfind.e and load it in Eclipse via Macro > Load Module..., these options should be available, and they should populate the 'Look in' field with your workspace or project directory. Let me know how it works.
- Ryan
NOTE: This hotfix is compatible with Core 3.5.