I called up their customer service to inquire about this and I've been told that it is not available in the foreseeable future. Ironically, this is due to the less demand for it, or so I've been told. Anyway, it is a massive disappointment for small investors like us, that a chunk of our investment goes into the fees such as the quarterly maintenance fee and the service that we get is horrible.
I think the best course of action that you could do is to just manually reinvest your dividend into shares that you like, in which IG would earn a commission fee. Another option would be to just wait until you have a significant dividend and then reinvest it on a quarterly basis so you only have to pay the commission fee once every quarter.
Personally, if I have shares that earn monthly dividends, I would just manually reinvest it every month so it will compound. By paying the commission every month, at least you don't have to pay the quarterly maintenance in lieu of the three transaction that you will do every month.