script and character constants

Is there any real way to use character constants in a RouterOS script?
As described here: http://forum.mikrotik.com/t/user-manager-reminders/64854/1 .
I use 6.7 . I tried to use character constants in terminal because I would make some reminder scripts for UM.
I tried something as this:

global a /
set a [/tool user-manager user get 1 %u_actualProfileLeft%] /

whithout success. I cannot find any way to use %u_actualProfileLeft% (as any other character constant) in terminal.
I’m finding to abandon UM because I think it’s very unuseful if it isn’t able to send notices and reminders to administrator about users profile expiration!

Is there anyone who use “character constants” in scripts?

As Wiki says (http://wiki.mikrotik.com/wiki/User_Manager/Character_constants),
these ‘character constans’ are available only for voucher template.
Is not mentioned in any place that they are also available from scripts.

Regards,

And so, how can be made a reminder script to have some notice when a user profile is reaching expiration? Where can I extract from UM information about user profile state to use for e-mail alert?

Probably it’s impossible to use these ‘character constans’ from script.
Maybe you should make feature request for this.

Regards,