These signals require special handling, as described below. We are not
pursuing this, as two other projects have or will resolve it.
First, POE::Component::TSTP exists and adds support for ^Z/Ctrl-Z in POE
programs.
Second, once _signal is fully deprecated we can stop registering
handlers for everything. SIGTSTP will suspend the program by default.
[ From
http://poe.perl.org/?POE_RFCs/Signal_Reforms ]