ok, never realized all subtitlies (quibbles?) of using.. and in the import of Modern::Perl there is something i dont understand but i can replicate.
While i suggest following wiser adivice you can play with: 
package FirmaTest {
  print "welcome to FirmaTest\n";
  sub import
  {
    use feature ();
    feature->import ('say');
  }
  use strict;    #strictures are imported
                 # while warnings are not
  #use warnings; seems not enough..
  $^W=1;         # but setting $^W seems ok!
  
  $ENV{'FirmaTest'} = 1;#it works
  
  use POSIX qw (strftime);
}

1;

[download]
It seems to do the right think you want (notice the windows quotation..): 
perl -MFirmaTest -e " print qq(warnings: $^W\n); print qq(ENV: $ENV{'F
+irmaTest'}\n); say qw(saying: aa)
 my $str = POSIX::strftime( '%B %d, %Y',0, 0, 0, 12, 11, 115, 2 );say 
+qq(POSIX::strftime: $str)  "


#output:
welcome to FirmaTest
warnings: 1
ENV: 1
saying:aa
POSIX::strftime: dicembre 12, 2015

[download]
HtH
L*
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

In reply to Re^3: How to export several modules intu users name space to not have a use ...; use ...; use ...; with the same modules all over again by Discipulus
in thread How to export several modules intu users name space to not have a use ...; use ...; use ...; with the same modules all over again by bigj

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