Art_graphic:
Using the 2D Symbol window of the Object rather than the 2D Script is very limiting, and not intended for the type of control you want. To create a 2D Script for your Object you have two options:
1. Set up the Plan Window and 2D Script next to each other, then drag the 2D elements from the plan into the 2D Script window, ArchiCAD will write the code for the 2D elements.
2. If the above does not work (it can be a bit tricky), hide all the elements in the plan view except for the 2D elements for your object and Save As... ArchiCAD Object File, again the 2D elements will be converted to code in the 2D Script.
Make sure the 3D elements and 2D elements have a common origin (best to use the Project origin) so they align correctly in your object. You are generating the 2D and 3D separately, it is up to the user to make sure the 2D and 3D correspond.
Scripting in GDL gives you more control over your objects, but takes some time to understand. Getting the scale of 2D text to work as desired is a good small project to start.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
David