-let them change intractable for buttons, input fields and toggles
Yes, I will add that in the next update.
And could you add these new type of UI element: Drop down
I've experimented with drop-downs in the game UI and what I've found is that they're really hard to make work well on small screen sizes. The problem is that the Unity drop down doesn't wrap text, so the longest option in the drop down needs to be shorter than the width of the screen or everything gets messed up. Also if the drop down ends up being near the middle or bottom half of the screen, the options end up dropping off the bottom and it causes lots of issues.
In general, it's VERY hard to get a drop down working on all screen sizes, unless all options are very short. It requires a lot of testing and I don't want to add an option for mod developers that isn't going to work very well. If all options are very short, it's usually easier to use radio buttons.
If the options are longer, a better option is to use a button that prompts up a list of options when clicked.
Could you also please add this option for mods:
-let them set an character limit for input fields
Sure, I'll add a character limit for the text input field.