Variable substract or add with arrays

There are many ways to refer to arrays and get values from them, for example: 

%arr (#), %arr(#>), %arr(#<), %arr (1:2) etc... but in the action "add or substract" it is not possible to enter " arr(1:2) " or similar.

I think it would be very useful to be able to use this to add or subtract multiple values from an array. it is very tedious to have to create actions to subtract each of the values of an array.

I hope this idea is taken into account, bye!