Redmine

Dear community,

frankly speaking: I'm not an expert, but I tried google and the on-board search before I ended up with my question here.
I've got general questions about Redmine's password policy. I know that some features have been added to v2.4.0 enabling strong password enforcement.
However, is there a possibility to configure Redmine to...
a) ...let passwords expire within a certain period?
b) ...lock accounts when too many wrong passwords were entered?

Do you know if there have been any updates so far concerning these questions or can you give me some plugin recommendations?

Thanks a lot,
Simon

P.S.: current install: 2.3.3.stable / ruby 1.8.7-p357 / rails 3.2.13 / mySQL