Primeface input text enter key : JSF 2.0,PrimeFaces 5.3

Hello, I have developed a navigation control (using jquery) that when you press the enter key in some component of the form (input text, autocomplete, etc) Focus jump to the next component, so you can browse without use the mouse. One of my component it's a input text area so I need replace the enter key by other to do a line break. I have researched and find out that I can use next code to catch the enter key in input text area.

    <p:inputText id="commentInput" rendered="#{foo.rendered}" 
    value="#{foo.value}"
    onkeypress="if (event.keyCode == 13) { onchange(); return false; }">
    <f:ajax event="change" listener="#{foo.test}" />
</p:inputText>

Well my question is, It's possible using other key combination to produce a line break in the input text area? Maybe Alt + Enter key or similar.
This applicattion is a port of other desktop applicattion, so I need copy the behaviour.

Regards.