CQ Modifier is Too Limited

[WJ9T]

Wonderful program! I would like to use it for the upcoming Field Day activities, but the CQ Modifier is limited to only four letters or three numbers with no mixing of numbers or letters. The typical exchange for FT-8 on Field Day is a mix of letters and a number (ie. 1ANV). At present, this is not accepted by the program. Would it be possible to simply specify this field to accept any four characters? Thank you for your help and a wonderful FT-8 program.