Could I make a suggestion; that it be made easier to use custom dynamic strings?
An example of this is that I was trying to make custom profile fields have help text that was extracted from the custom profile field description. But the help button was expecting an identifier and component. I would have just created a custom string of {$a} and passed through the description as a parameter. But the help button doesn't accept string parameters.
On a related note, could there be a language string of {$a} in the moodle language file? I see that there is one in the error file but I think that a generic one in the moodle file would be welcomed.
I look forward to hearing peoples thoughts.