It would be nice to add support for extending files and folders to a new disk if the current disk size is not enough. There is currently no Linux burning software that does this. If I drag a large folder for backup and the disk is not enough then the rest of the files and folders should be written on multiple disks or show something like 5 Blu-rays are needed for burning files and folders. CD burner XP, NTI CD Maker all have this option to continue burning to multiple disks.
Something you could try out is creating part archives using 7z. However, the limitation is that files need to be extracted before being readable. You can also split files into separate folders using a file manager. The Nemo file manager shows the selection size in real time at the bottom.