In my humble opinion:
1. A 3 degree slope approx 320ft/NM which we expect our pilots to calculate based on DME (VOR or ILS) distance to touchdown;
2. We use MDA + 50ft as our Visual Descent Point (VDP) equiv to DA. At this altitude, if insufficient visual cues, commence GoAround, climbing & TRACK to appropriate turning point on the published Missed Approach Procedure.
This way, if you get visual you will be in the slot with no pitch changes required for the continuation to landing. This also complies with the FSF Stabilised Approach Criteria. (wheras Dive&Drive may not).