apache module: Mutex setting with apache > 2.4

Basic Info
Module Version: mod 'puppetlabs-apache', '3.0.0'
Puppet Version: 4.10.10
OS Name/Version: Ubuntu 16.04 / Apache 2.4

Desired Behavior:

mod_ssl should only set "Mutex" when needed, apache 2.4 default is "Default", so not setting it in ssl.conf should not change the behavior.

If needed, it should look somehow like this:

Mutex $mechanism ssl-cache
Mutes $mechanism ssl-stapling

Actual Behavior:

Mutex default

Look at https://httpd.apache.org/docs/2.4/en/mod/core.html#mutex for further explanation.

My problem was, that I need a different "default" setting for all mutexes and ssl.conf reseted that to the default.

An option for setting Mutex entries in the apache2.conf would be cool!