Fair enough:

# in your httpd.conf
PerlModule Apache::compat

# or in your startup.pl
use Apache::compat;
[download]

Note that there will be overhead for using this module, however, it should allow *most* of your 1.x mod_perl code work under mod_perl 2.0 (ok... 1.99). You may also want to read A reference to mod_perl 1.0 to mod_perl 2.0 Migration.

Hope this helps.