Add official TypeScript support.
I love Construct and came back to it not so long ago since the addition of scripting support. Actually, now that R226 introduced modules, it's on par with the big serious engines on the market.
But then, there is TypeScript.
TypeScript is becoming more and more popular and Construct can really float on this boat among people that are more experienced in programming (you could have a landing page targeted to "web developers").
I'm personally among the developers that were wrong about TypeScript (and ditched it for a long time) and now see how useful (and attractive) the language really is for developers and teams. There is a huge trend of typescript adoption among game and web frameworks too.