On aircraft with a FPA (Flight Path Angle) on the autopilot, European JAR-OPS requires that it is used iso the usual V/S mode.
This means you simply track the radial inbound and set the published FPA (for instance 3.7%). The plane will then descent on a virtual glideslope towards the runway once its horizontal path intersects with the virtual glidslope.
During the approach you'll see the autopilot will modulate the V/S in function of the (normally deceasing) GS and you'll skim the tops (if any) of the intermediate stepdowns.
When apporaching the MDA, no level flight till the MAP is made; instead the MDA must be considered as a DA and a go-around must be executed! This poses no big problem (for instance a too early immediate left turn), because of the design of the FPA mode, which will make sure the MDA will always be reached very shortly before (0.2NM at the max) or on the MAP itself (at the very latest).
Also note that in this FPA technique no VDP (Visual Descent Point) is to be used by the crew, but rather do they use the normal call outs and procedures as for a precision approach.
Quite clever from Airbus, isn't it?
BTW, does anybody know if you can do this FPA technique on the B737NG or B777 as well?