If it's so difficult, maybe it would be a first step to include the possibility for users to manually define deicing areas. Via the GSX config
It won't be the first step. It would be the only way to do it, as I already explained in my previous reply.
or, maybe easier, via the Afcad. E.g. installing a gate where the deicing pad should be in the Afcad, and select to use this gate as a deicing are only in the GSX config.
If you mean adding a fake parking to be flagged as deicing, then no, it's very cumbersome, it would require editing the AFCAD which might be updated by the scenery developer (losing all the changes), and it's not right having an isolated parking just to point out some coordinates.
It should be something ideally linked to the scenery customization page, but it should be set anywhere in the airport, with a position and size and, it would be a bit of an exception of how the editor works right now, because it would be unrelated to an actual parking.
We'll eventually have it, but it's just we are working on much bigger things right now.