I edited the GECKCustom.ini file to allow the use of multiple master files at once, but when I try to load one of my .esps with all three current .esms checked as well it fails with an error message saying that loading multiple master files is not allowed.
The relevant line is
bAllowMultipleMasterLoads=0
And I changed it to
bAllowMultipleMasterLoads=1
as instructed by the GECK tip list on the wiki, but the attempts fail and upon checking the .ini file again I find that the setting has been forcibly reverted to 0 thus negating my change.
Has something been altered between iterations of the GECK that auto-blocks permitting the use of multiple masters at once? If so, that strikes me as rather shortsighted given that the DLCs are being released as .esms and blocking their loading at the same time as the main game will make modding any assets therein something of a pain.