correct provisioning to install drush and correct config files + module definition for menu access problem
<IfModule mpm_itk_module>
StartServers <%= @startservers %>
MinSpareServers <%= @minspareservers %>
MaxSpareServers <%= @maxspareservers %>
ServerLimit <%= @serverlimit %>
MaxClients <%= @maxclients %>
MaxRequestsPerChild <%= @maxrequestsperchild %>
</IfModule>