Limit door.sys numeric values to 32767
The DoorFrame door library will about with "Overflow Error" if it reads a door.sys file with lines 16 (calls), 42 (minute credits), or 52 (posted messages) with a value > 32767, the maximum positive value of a signed 16-bit integer. So cap these values in the door.sys file at that maximum. This does potentially break/limit doors that give minutes using the door.sys drop file, so use that "modify user data" option in SCFG with care. Electrosys initially reported this problem with the Lemonade! door game which was barfing on a line 42 value of 449632.