Many different protocols have the write only concept. Supporting this in SQLTags would make supporting these protocols easier.
eg: write a 1 to a control point. The feedback (if any) would be a different point that would be read only.
You can set read/write permissions on SQLTags. If you set the SQLTag permissions to be read-only, you may get the results you’re after.
Actually, today I would set up a read/write tag and just never read it
Then you should use the system.opc.writeValue function to write without reading. It doesn’t really make sense to create a tag just for writing purposes.
Sure it does 
you just need the 'write' context.
But thanks for the tip, I'll look into that.