Midland you are correct, however it can become "impossible" due to flap limits.
The 767 when "clean" (no flap or gear) will accelerate significantly down a 3 degree approach. At flap 5, and about 180kts or less, it will 'just' hang on to 3 degrees without accelerating.
At flap 1, the aircraft will continue to accelerate, and quite quickly break the Flap 1 Limit speed... and so, in a way, it is "impossible" to do it, if that makes sense.
To intercept the G/S from above, with flap 5 out you need some additional form of drag. The most effective way to do this is Gear, although speedbrake will work if you are a reasonable way out and just need to have a slight increase in rate of descent.
Pottwiddler - "Descend with the ILS" means that you must be established within tolerance on the ILS (both LOC and G/S) before you descend. Descend on the Glideslope is a clearance to do just that... descend on the glideslope, possibly without being established on the LOC. It is a minor thing, but could create problems if the pilot interprets the clearance to descend on the G/S from wherever they are, and that is not what ATC are wanting. If the instruction is given when already established, there is not really any difference, but if the instruction is given prior to LOC intercept, then it may cause confusion, and apparently ATC are using new phrases to avoid that.