Bank feed rules - bank transfer

On bank feeds, there is the option to create a bank transfer manually for a transaction. However when creating bank rules, there doesn't seem to be functionality to create a rule for a bank transfer. We have over 100 different cashbooks and the automated rule for transfers between the cashbook would save a huge amount of time and I believe would be used by many companies. I work for several different organisations.and all would use this feature. Hopefully it shouldn't be too much work to enable this as it is a function on the manual menu, just not the automated bank rules