Not sure if this is exactly what you want but you can create custom symbols and add them to the custom symbol library. I haven't messed with this for some time now but you can Search for forum discussions on custom symbols or Gtol.sym (which is the library file name I believe).
Thank you, that's certainly easier - I can put that symbol file in our PDM system as well so others can use it.
Any idea how to adjust the line weight of a symbol?
For those interested, here's the definition I settled on:
This includes the = sign, so just remove the last two lines if you don't want that to be part of the symbol