Are questions about implementation of specific tasks in specific computer algebra systems on-topic here?
If so, can we create a computer-algebra tag?
Context: I have been feeling around on the StackExchange network for an appropriate place to ask nuts-and-bolts questions about how to implement specific mathematical tasks in the computer algebra system Magma. It was suggested to me at meta.math.SE by user quid to try this site, and just on the basis of the site description this seemed like the right place, as these questions are certainly about "computational methods used in technical disciplines". At the time that I asked my first question, there did not exist a computer-algebra tag or a magma-cas tag. A magma-cas tag has subsequently been created by user hardmath.