If you have connected a radio interface either directly by RS232 or by an emulated USB port to your Mac you can’t access the interface for acquiring the frequency, mode, etc. with both programs at the same time. As MacLoggerDX has a great AppleScript interface you can create a small script that will be integrated as macro into fldigi by using the EXEC command.

The script will look like this:

tell application „MacLoggerDX“
lookup (system attribute „FLDIGI_LOG_CALL“)
delay (1)
set rawfrequency to (system attribute „FLDIGI_FREQUENCY“)
set mldxfrequency to rawfrequency / 1000000
setLogFrequency mldxfrequency
setLogMode (system attribute „FLDIGI_MODEM“)
log
end tell

The frequency needs to be converted to MHz because MLDX only wants this format. Now you can just click your macro and the QSO will be logged correctly.

As ICOM doesn’t provide any information concerning TX/RX (MARS/CAP) modifications for the new ID-5100 I investigated the detailed function of the diode matrix responsible for the localization.
Due to the absence of any circuit diagram and the non-descriptive PCB I can’t tell the diode numbers – I can only show them.

To get access to the PCB only the lower cover needs to be removed (8 screws).

The upper 3 diodes need to be removed in order to gain „full functionality“.

before and after the modification
The left picture shows the standard configuration for an IC-5100E that is intended for german use.

( 1 )   ( 2 )
( 3* ) ( 4 )
( 5 )   ( 6 )
( 7 )   ( 8 )
( 9 )   ( 10 )
          ( 11 )
        ( 12* )

        ( 13 )  ( 14* )
        ( 15* ) ( 16* )

* -> installed by default

3 -> TX 70cm ext.
12 -> Crossband
14 -> TX 2m ext.
15 -> the removal converts the transceiver into the japanese version
16 -> the removal converts the transceiver into the american version (IC-5100A)