Yes, I discovered that much but is direct entry into the flight plan not supported? If not, is it planned to be added later? Or was it not supported by the IRL FMS?
Btw, just a note, on the XP version after creating several PBD waypoints when going to the REF>Next>Defined Waypoints list it corrupts and shuts down all the FMS and Nav displays. Fortunately on FMS2 this works fine.
Also, in the XP version the format 4300.0S/14100.0E results in a format error when trying to create a custom waypoint. I think there is one extra box after the dot for the LONG component. The same entry works in MSFS and there is one less box there.