Hm. Might be able to do it by altering sub eval() ... yes, quite easily!

Setting $DB::onetimeDump to 'dump' and calling DB::eval will do exactly what you want. Try this in your .perldb:

sub DB::new_eval { local $DB::onetimeDump = 'dump'; &DB::old_eval(@_);
+ }
*DB::old_eval = \&DB::eval;
*DB::eval = \&DB::new_eval;
[download]

It's perldb.ini if you're on Windows. You get output like this:

[tearought-lm|(none)]04:54 PM $ perl -de0

Loading DB routines from perl5db.pl version 1.31
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

main::(-e:1):   0
  DB<1> [1..10]
0  ARRAY(0x800cc0)
   0  1
   1  2
   2  3
   3  4
   4  5
   5  6
   6  7
   7  8
   8  9
   9  10

  DB<2>
[download]

This is just copying the old eval to a new name, creating a new sub that calls it after setting up $onetimeDump property, and substituting the new sub for the old one. it's not perfect:

  DB<4> print "my father plays dominos\n"
my father plays dominos
0  1

  DB<5>
[download]

but should basically do what you're looking for. You'd need to patch up the dumping function a little more for perfection.