specify the location of non-default launchpad in the qadapter object

According to the docs there are several ways to create the LaunchPad object. Too there are several ways to create the qadapter object. The first way to create the launchpad and the second way to create the qadapter will work automatically in combination. But if we create a custom launchpad object (second option here) or have a non-default launchpad file (third option here) these have to be specified in the qadapter object if the latter is non-default qadapter. This has to be described in the docs and/or these cases should be handled by the engine internally to adapt the qadapter if necessary.