Expand player data commands with add & subtract

[RustyDagger]

I would like to have the player data commands expanded to include an add & subtract sub command. something like

/zm player add [amount]
/zm player subtract [amount]

the amount being optional and defaulting to 1.

This would be useful for creating limited use buttons with 4 or so clicks until disabling and allowing console to add more use's

No doubt some corner cases will exist such as a key not existing and a key containing a string rather than an integer.

[RustyDagger]

any idea of if / when this could be added? or should I make alternate arrangements to achieve the same result?

[Maxlego08]

For next version !