So - you have a helper (hep) file in which you have a helper 'applicable to' a term - which is a new term in Rhapsody. That helper appears on the right-click menu for any model element of that type. However it does not appear on the right-click menu for any model element of the base type.
For example if you had a new term based on Use Case called 'Capability' - your helper would only appear on the right-click menu for Capabilities - not Use Cases.
Most of the time that's exactly what you want - but what if you DO want the helper to also appear on the base term context menu ?
The answer is really simple, albeit undocumented. Until now.
In your hep file, instead of using 'applicableTo' - use 'applicableToNonStrict'
That's it. Enjoy !