Make the Custom Function builder a "global variable", this will allow a heavily used function to be able to be pulled into a form whenever a new one is built. This will heavily reduce "time to build". And increase development speed, you could also align this custom function to the AI formula builder to seriously speed up the building process. The Variables in the formula can be "value" so that it pulls in the "value" of the control when used (up to the developer to change it for the form if required.