Custom invoicing descriptions

It would be great if the invoice description fields could have a system setting where we could set the default description using a similar system to template fields.

For example, invoicing units in an enrolment has

• Unit of Competency enrolment: Student Name - Unit Code

Would be nice to include things such as nominal hours, drop the "unit of competency enrolment" text, etc. Same with workshop invoices - it would be nice for us to be able to set a default text.