I completely understand why you want this. I also sometimes miss it when working with AIMMS, as I am so used to it in other IDE’s (like Visual Studio).

Unfortunately, the syntax editor that we are using is a third party editor and it does not support this feature so it will be really hard to get this in. Besides that, we have plans for a completely new model editing IDE so we don’t do that much new development in the current IDE. 

We will definitely look to this feature again when working on this new IDE.

Update: Still a valid idea but as any possible implementation will be far in the future, I’ve changed the status to “discussion ongoing”

We are currently in the process of developing a new AIMMS IDE, which will include this feature request. However, since this is a long-term project, we will not implement the feature in the current IDE and will therefore decline the request for now. The new IDE will likely take the form of one or more VS Code plugins, enabling the development of AIMMS applications while leveraging the rich functionality already available in VS Code.