Currently, the command editor allows for creating custom commands in a Model-Driven app (MDA). But, if that MDA and command/component library are passed within a solution to a separate target environment as managed, an unmanaged layer cannot be put overtop of the MDA and library in said target env without problems. If this is done, for say client-specific needs related to a command, then any future additions to the original MDA and library in the source environment and then again passed as managed, will not be honored for ALL commands in the target env. This is because a single unmanaged layer is placed over the entire library instead of per command. Multiple command libraries per app are also not supported at this time.

One of the two changes would be huge, as we now have to manually edit the same command in multiple environments, with the same formulas.