Can you (author of uCalc) customize the uCalc FMP product so that it will do [feature description]?
No. Custom modifications to the product itself are not done for individual customers. Version 2.9, however, was re-designed in a very modular way that makes it possible to extend its functionality well beyond what is documented. You may want to post your question in the uCalc forums to see if someone might be able to help. Or you may need to hire a consultant well versed in uCalc FMP and uCalc Language Builder to customize uCalc for your needs.