If you want to get an idea of how to use an Aslan/cat-like race in a SF setting - look at CJ Cherryh's Chanur series of books - the best treatment of a cat-like race I've seen. In some ways she explores a similar Aslan stereotype, but also gives an explanation why Aslan females might handle all of the 'other stuff'; Hani (pseudo-Aslan) males in her setting are culturally set up to fight for 'Alpha male' dominance, their reflexes and brains are wired for an instant 'fight' reflex, they don't have a 'flight' response. This means that Hani males would react to any thing new or unusual by instantly attacking it, which is why they are not trusted to be anything that might require a careful or measured response to a new situation (pretty much everything in fact).