I uploaded beta of my buymenu 2.0
See what commands i block.
Also you asked about how to save player-related data - you can use my bank code from example (attachment) and how upload items from file.
Anyway I'm going to re-master my buymenu system once again before release (4th time, lol) - I think I'll stick with custom native zp_register_buymenu_item instead from loading items from file.
thx dude.
anyways. i not gonna need this now. because, i accidentally formatted my drive. so i got fix something first before i re write my mod all over again.