Configuring the BalancerMember and using mod_cluster goes against the mod_cluster goals of a zero (or minimal) configuration.
Additionally if you don't configure the instance-id in the AS7 configuration a generated JVMRoute will be used.
If it works in 2.2.x then it should work in 2.4.x too so please report a JIRA.
After further verification, I could determine that when the configuration contains the BalancerMember directives, both httpd-2.2.24 and httpd-2.4.6 crash.
Regarding the 'stickysession' directive: it works as expected in httpd-2.2.24 but appears to be ignored in httpd-2.4.6.
I updated MODCLUSTER-359 with all the details.