Since the last version of the JD990 layout, I had begun to create a framework for the later JV's and XV's but have held back on progressing them for the moment due to the complexities of implementing certain mechanics. No doubt though with the ongoing development and the continual addition of new features and frankly amazing support and commitment of this app and it's community from it's programmer, I think it won't be too long before such a project becomes far more viable me reckons.
On the other hand, it is still possible.... ;)