It could be added but I don't know if the work and extra complication involved is worthwhile. AFAIK, yours is the first and only request for this.
No. I couldn't find any GUI apps that did what you need. That is where I looked first.
Fehlix is preparing instructions but the commands have already been outlined above.
1) First you need to make the live-usb with gpt partitioning (this *might* be an option in the GUI tool already, I don't know). As Fehlix said:
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sudo live-usb-maker --gpt --size=50 --from=/ISO/MX-Linux/MX-18/MX-18_x64.iso
2) Then run gparted to add the 3rd partition.
3) finally, ASSUMING your live-usb is at /dev/sdd (the program above will tell you where it is as it runs) then simply do:
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sudo sgdisk --transpose=1:2 /dev/sdd
The size option in the first command tells us to use 50% of the usb for the live system and leave 50% free. If you want more space for data then use a smaller percentage like --size=30. Also, it is very important that you get the /dev/ name correct in the third command. I will often run "lsblk" or "lsblk -o name,fstype,size,label" to make sure I know where the device is.