Why not a preference in AxeEdit to allow power users to set modifiers on all parameters ?It's the age old adage: Just because you can, doesn't mean you should.
Yes, this is a bug. I will fix this in the next release.
There are usually good reasons why some parameters do not allow modifiers. It is better to request (through the wishlist) that certain parameters can be modifiable at the hardware level. This allows Cliff to investigate whether there are any adverse affects to the algorithms.