In the file plugins\ppscripting\\includes\\Zen Coding.js looking for the line:
\r
addMenuItem('Expand Abbreviation', 'expand_abbreviation', 'Ctrl+E');
and replace CTRL+E on any comfortable combination (ALT,CTRL,SHIFT, and single character).
If you want CTRL+space, you need a little more to change, looking for
\r
function addMenuItem(name, action, keystroke) {
after the line
\r
for (var i = 0, il = keys.length; i < il; i++) {
var key = keys[i].toLowerCase();
need to add:
\r
if (key=='space') key=' ';
And now the line
\r
addMenuItem('Expand Abbreviation', 'expand_abbreviation', 'Ctrl+E');
change to
\r
addMenuItem('Expand Abbreviation', 'expand_abbreviation', 'Ctrl+Space');
Then you work CTRL+space.