The name suggest running a command and copy files. However the commands need to be specified as a regex-map list which might be executed for every source instead of once. Often a workflow might be just ./custom_configure && ./custom_build.sh which is not easy to map to this.
Instead allow non-tuples which are considered as commands to be run. When mixing tuples and non-tuples the plain commands are run last.

This was always a concern of mine that a workflow consisting of running only a command that involves some custom install procedure was less obvious than it might be. It came up recently where an EC uses MakeCp requiring parallel = False as it replaces the make cmd by a single command. In that case it is ./configure --options and ./coconut which isn't easily applicable using CmdCp

With this change it can be:

cmds_map = [
    "./configure --option1 --option2",
    "./coconut --flag 1 --flag 2",
]

I'd say this is easier to read and understand than:

cmds_map = [
   (".*", "./configure --option1 --option2 && ./coconut --flag 1 --flag 2"),
]

Also error reporting would be more focused, i.e. either "./configure failed" or "./coconut failed"

I can port a couple easyconfigs to the new syntax in a PR to the easyconfig repo for test reports and usage examples.