Good points and good posting. Thanks for the heads up on Decker's book.
I don't agree with him on the Russians. The Russians came into the artillery game late and the 1805 reforms were excellent regarding equipment and weapons. The French admired the licornes and used them when they captured any. But the officer training/education was lacking and as far as I can find they didn't actually have an artillery school until 1820-21. Their employment of artillery during the wars was defensive only. General Sievers remarked that their equipment and weapons was just as good as the French, but their employment was not up to the level of the French. Further, their command and control was lacking, though certain artillery senior officers were attempting to change that as the war went on. There was considerable improvement in 1813-1815, but theirs was quantity over quality. In that respect, they haven't changed much in employment over the years.
The Liechtenstein System was excellent, but the Austrians had no actual horse artillery during the period. The cavalry batteries had to be accompanied and supported by cavalry in order to protect the artillery. It was not as mobile as the French, British, Wurttemberg, or Russian horse artillery. Further, the Austrians never used their artillery as aggressively as the French, though I would rate them higher than the Russians overall. Their artillery education system was modeled on the French system and in the Seven Years' War they had a shortage of trained artillery officers and engineers which is why French officers of those branches were seconded to Austria during the war.
Technically speaking, the British had the best equipment, skilled artillerymen, and more than competent senior officers. With the introduction of the block trail and the new limbers and caissons, they had the most modern and best designed equipment of the period. There officers were as well-trained as the French and Austrian.
Decker might be describing a drag rope which was different than a prolonge. The difference is in the design of the tool and in its use.