Certainly.
Edit: admin\includes\functions\extra_functions\multi_xsell.php
around line 237 you will find this partial code segment...
array(\'1\', \'2\', \'3\', \'4\', \'5\')
Edit and expand that to however many you want.
Also edit: includes\languages\english\extra_definitions\YOUR_TEMPLATE\multi_xsell_box_defin es.php
Add definitions for the extra headings here.
Then uninstall and reinstall from the admin (the cross sell databases will not be removed)
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