Yeah, I hope that, now that this option has disappeared from the game, you will add an improved version in the next edition (e.g. adding missing positions like DM or allowing the creation of regens for more than 35 years ahead).
I think if you add the improved support for custom regens, many players will buy FM23, even in the absence of any other new features. If you add such an option, huge mods will be created for your games that will attract a lot of new players, there will certainly be a lot of gameplays on YT. Marketing-wise it will help you a lot, and I think it shouldn't cost too much work to add such functionality to the editor.
@Neil Brock