Check services by default ?

Hello,

We’re using webba in multiservice mode. We have a few (6) different services, and would like to have them checked / selected by default on first step, so that user just uncheck some if s·he really doesn’t want to see it.

I can easily use some js for this :
jQuery("input.wbk_service_checkbox").prop( "checked", true ).trigger('change');

but would love a native feature if it exists ??