Correct. If you use the tool that is listed with that terminal then you are fine.. If not, you are not in compliance. However, UL actually allows (for some standards) a second method of securement in addition to an improper crimp tool. Heat shrink tubing is acceptable (so we were told) but is tough to find the correct shrink ratio that will grab the wire and fit around the insulation/barrel of the wire.
We are in the same boat.. We had to pony up to buy the correct tooling. Luckily we were able to switch to one manufacturer and only had to purchase one crimper and a few different heads and that covers every typical terminal (Q.C./Ring/Fork/insulated/non-insulated,etc..).
Your best bet is to find a dealer of used tooling (or ebay,etc...)and switch to one manufacturer as it will save you quite a bit. Crimp guns aren't cheap either.. Manual tools are typically $150-300 and some pneumatics are $2,000 or more. Then you've got applicators and their associated dies for larger volumes.. Crimpin' ain't cheap..