Prescription - add free text when increasing/decreasing a medication

At present, when you want to increase or decrease a medication, you have to choose a dosage from the list. A COMTL nephrologist would like to be able to enter free text, as some medication doses are not on the list. She gave the example of Hydralazine. Sometimes she wants to increase the dose by 60.5 mg, but she can't select this dose because it's not on the list.