eric7,
#1 Readjust the toe angle when you fit the oil shocks.
#2 The camber angle will cause more tyre wear on the inner edge of the tyre. This is unavoidable, but one of the limitations with the fixed top c hub arms.
3 racing do a make an adjustable arm set, however these are illegal to use in Mini racing. They would be suitable for carpark bashing though.
To get longer tyre life from the Type A 60D's then double stuff them with a Sorex A or C firm and then put in the black Tamiya foam. This takes a little fiddling to get the tyre to sit properly on the rim, however can be done. Tyres stuffed this way last longer, however they will still wear out on the inner edge.
There is a good article on this in Tony Gray's mini web site.
http://www.rc-mini.net
This is a great site has a wealth of mini information. I thoroughly recommend it and give it four and half out of five stars.
Later
Calvin.