True, I did mine on the A310 sim (although configured for A300), and I'd been on FBW aircraft for the preceeding 5 years, hadn't touched a trim wheel or Auto Throttle for that long, but it didn't matter!
They are not looking for pure flying skill, only:
1.Good CRM
2.Good flight deck management
3.Good SA
4.Good descision making (I've heard of guys who didn't land the Sim, or even manage to 'Round up' the ILS who got the job, because they made the right descision and went around!)
You will not be expected to know anything about the A/C you do the sim in (in fact if you are already type rated on it, they will expect a much higher standard!), they will tell you to operate it just like your current type, including calling for your own flap settings/speeds etc.
Enjoy