There is a fortune to be made by someone who would create an engine and sample libraries designed solely for those who compose without a music keyboard. Remove all the interactions that require a physical music keyboard and highlight and magnify input from the computer keyboard and interaction from the notation software.
Of course the great majority of users use midi controllers to input, for those of who can not or elect not to use such input, the development of such software would be wonderful Because of the perceived small number of computer-only composers the price of such new software would be expensive. I understand that. Well, maybe someone such as Gary would again arise from the depths and decide to make it available at reasonable prices.