I'm sure we can all agree that there are several things these thing need so to save Outlaw some headaches by listing out as many as we can than.
Card Types:
Pendulum Monster Cards
Fusion Spell & Trap Cards
Other Custom Card Types
The two above Other Custom Card Types are in the game in some form or another but not in the Maker or Added as blanks we could use. The added still needs to account for Pendulum Effect or be able to spit the effect description using the Pendulum Effect and Monster Effect Key words. As for the Maker itself it just doesn't have Pendulums on the list at all and it doesn't want to play nice for adding Fusion Spells and Traps either from the looks of it. >.>
Now as for our other Custom Card Types having the Blanks coded in for use would help us save some time too.
Now anything anyone else wants?