I am just curious as relating to vLV's quote
he seems to have treated his Askaris well and they appear to have been motivated also
Since I have in mind the british reluctance and distrust for armed natives I was asking myself who had the most diplomatic attitude of all colonialist countries
(and by this I do not intend to justify colonialism as such)
might make an interesting Askari morale rule to mix up colonial scenarios 
Well, I'd argued for the Germans in East Africa. They weren't perfect, but consider...
- Blacks in East Africa could gain citizenship
- Blacks could be promoted to command positions within the Schutztruppe
- Blacks could, and did, win the Blue Max (as happened during the Wahehe War)
- Black units were trusted with items like machine guns whereas, comparatively, the Belgians did not allow all black machine gun units.
Granted, they were less than benevolent in other African colonies, and I'm not trying to justify their behavior.
One interesting story is related in "Battle for the Bundu". Not sure if you guys have already heard this, and I don't mean to hijack, but it's a great tale of a great man (in my opinion, granted.)
In the late 1950s/early 1960s, the German Government decided to fulfill it's promise of paying each and every Askari a pension for his service to the Empire. The problem was that many of the former Askaris in Tanzania and neighboring countries had since lost their paperwork, while others were unable to read. The solution was to contact Lettow, and to ask him to undertake one last mission for Germany. He gladly accepted.
In (can't recall the year, I'm thinking it was early sixties, don't have my copy of the book here), Lettow (though advanced in age) went to East Africa. His proposal was that any soldier who had been trained in the Schutztruppe OstAfrika would remember their Prussian Drill. He suggested that any man who could suitably demonstrate at least part of the drill should be awarded a pension.
The Germans were unsure whether this would work, but Lettow was a national hero, so they agreed.
Lettow arrived in Tanzania and upon stepping onto the docks at Dar Es Salaam saw an eldery porter quietly unloading baggage from the ship. He immediately addressed him. "Don't you recognize your old commander, soldier?!" The porter immediately snapped to attention and saluted him, before rushing off to alert other former Askaris in the area. Supposedly a bunch of these old men, and their sons, rushed out to welcome Lettow, some of them carrying them on their shoulders into town.
He proceeded to set up shop and see each applicant. He gave them a broom, instructed them to handle it like a rifle, and barked out commands in German. Several former German Askaris were rediscovered in this manner, and received their pensions.
Pretty cool story, I think.
-Doc