Isn't a bush flying course just another way of pulling money out of foreigner's pockets?
If you do intend to fly in southern Africa, you are most likely required to a flight test as part of your validation. Just book a few hours extra with decent flying school in order to prepare for the test and the trip later. A lot about "bush flying" is common sense really, something that can't be taught during a course. And I hate to think, that some foreign pilot, who has to get used to a new type, since the ones he might be used to, are not available down here, now starts fiddling with intermediate flap settings ("bush flaps") or other funny "bush tricks".
First of all, learn to fly the plane within it's limitations. If the POH says, it can't be done, then don't do it, not even with flaps set in between T/O and APPR.
Any decent instructor should have taught their students to keep the hands on the controls while taxiing and 'climb into the wind' or 'dive out of the wind'.
When on gravel, apply power as the speed increases. Nothing that one needs to spend hours in the a/c for.
However, unfortunately a lot of Europeans do come here and show a serious lack of airmanship and common sense. A couple of years ago I did quite a few trips as safety pilot. It's hazardous, man!