Append an environment variable: 'env append'

Hello,

You can append a string to an existing variable with:

=> env set var ${var} anotherval

but I was wondering if it would be interesting to have an explicit 'append' subcommand that facilitates this:

=> env append var anotherval

I would find it useful for variables that contain lists, like kernel arguments, and such. Has this been discussed in the past?

Thanks -- Hector Palacios