That's an interesting approach, — Please correct me if I'm wrong, but essentially what you're saying is that Scirra would benefit from adding in more features which would pull in more customers, in turn generating more revenue and allowing them to hire more people to improve the overall offering for everyone. A solid outlook, and one that I can't argue with on a "make cash now" level.
On a "make cash later" level, however, I really think that improving the existing offering and catering to the established customer base offers a more sustainable and organic form of growth. By catering to those people who have already paid their dollars, a healthy community is nurtured which a) brings in new customers by word of mouth, and b) brings in revenue from future projects (Construct 3 and/or paid-for assets (think of Unity's asset store), etc.). I don't know what's more beneficial to the customers and Scirra; I guess a lot of weighing up and number crunching/projections would be in order.
Definitely an interesting perspective, though.