Hi cj
From a front end perspective, entered lines on a transaction are treated as transactional lines and thus an account/item/activity and amount is required to be selected. This does mean that if you need to enter a description only line you would need to designate that line is different from a transactional line and thus inserting a header line is the recommendation to that do. A header line will allow the user to enter a description only for that line, other values such as tax code, job, date, quantity are not allowed to be entered as part of that header line.
To my knowledge, we don't have any immediate plans to introduce a description only line that will allow for those additional records (tax code, job, date, quantity...) to be entered with the AccountRight 20xx range. It may be something considered in the future for that product range but not something actively being worked on.