Hmm..
we started the fostering application process but stopped and put it on hold for a few years for family reasons, a few things you have said have made me think..
the SS attitude, it is frustrating having someone hlding your family's future in their hands, particularly if they have a superior attitude/less professional knowledge than you/ a lack of grasp of the english language (in my case)/a fondness of amateur pyschology or ridiculous questions. I feel your pain on that one.
The course does sound silly in that it is long and not very well placed, we went on a trining course one evening a week with buffet for evening meal so you could go straight from work.
Our local authority asks that the main carer does not work full time, as the children need more time and attention, you may have numerous appointments and meetings to attend regarding them, they need to feel someone is 'there', etc more than a child from a happy settled background does. Perhaps your LA is the same and this is why their course is on a weekday? It is silly though!
RE the course: it is not just for you to learn, it is also for others to guage you, your willingness to learn, or even being open to the idea you need to learn things, how you are with different characters and so on. But you know this yes?
Families ethnic background: This is SO important to a child! It is hard enough entering a family unit without them all being obviously different to you, not knowing your language, culture, food, music, etc. It is part of a child's identity and they may feel isolated, stripped of familiarity etc. I have spoken to foster carers who have cared for children from other cultures and put their heart and soul into making them feel welcome, even learning their language, they just yearn for their culuture around them and never settle.