Due to this fact I searched the whole forums to gather information?s, of what will be the next features up on your way for integration in Construc2 but to my pity I failed to find a "roadmap" or a "what?s next" information table.
Next thing to be added will probably be "families" as voted in this poll
So I will try it this way to gather information?s and ask 3 questions to you.
1. Will there be an internal code editor be on its way?
This topic might be of some help, C2 is designed to be "code-free" as much as possible.
... you can already code plugins in JS. In those plugin you may "insert" a JS library (I did it for the hashing plugin (this plugin is not up to date with r57) and the pathfinding behavior (provided with C2)).
For the plugins, I put the "library" code within the plugin.
Else "library integration" is pretty much a "<script src=" line in your exported index.html
(more infos about the exported html)
(also I'm not related to scirra, just 3rd party plugin dev and CC/C2 enthousiast)
3. Will there be a isometric API support or integration in the near future?
It's likely that the answer is no (as in not in a near future). As answered to question 1, Ashley's working on "families" and you can see the options he provided in the poll.