I had an idea and a vision for the longest time of what I thought a good RPG Maker engine would be for me, and my conclusion was it needed to have some sort of ABS in place. So I went ahead and played with photoshop and made this:

Basically, it integrates the enemy creation page with the BlizzABS enemy page, but instead of having specific enemies, this would allow each individual event be it's own enemy with it's own stats, abilities, etc.
Under the Actions page would be the combo, attack type, charge type, spells, etc.
Under the Efficiency page would be the element and state efficiency's.
Another thing is I do like the RMVX style of mapping, but not the graphics themselves. I enjoy the multiple layers and higher detail, but I wish RMXP had all the maps combined into one.
I also wish that RPG Maker had more stats, like Critical chance (instead of it being integrated with Agility) and Stamina (max health increase).
Cooldowns would also be wonderful for your spells, and have more creative options with spells, like have a built-in proc section, like casting has a % chance to do something.
Idk, just my ideas and thoughts. I would love to see something like this, but I could never do it myself. Guess it's just my dream!