Hope I can help.
1) see page 3 "Manouver". Units can change facing or formation. If they change facing by up to 45 degrees they may make a half move.
2) the rules don't specify when you fire. The example on page 8 shows a unit moving then firing however.
3) we play that a unit may about face but may not then move.
4) we're pretty loose about exactly how a unit physically manouvers - wheels are from a corner - as long as its not manouvering more than 45 degrees a pivots ok with us.
5) we field our horse in paired squadrons which fight side by as a unit, not as separate stands.
6) We square up our combats. For neatness sake only. There's nothing in the rules about only moving straight ahead when attacking. But the feeling is men surge forward when contact is made so parts of units would soon end in contact.
7) with the above in mind most of our combats are one on one
our regiments of horse, 4 squadrons, if we play any, move, fight and die as a single unit, not as 2 lots of 2 squadrons.
9) foot test morale if a foot unit is routing within 6in. I'd say that a unit contacted by another unit which is routing is therefore forced to check morale.
The key thing to consider is these are not competitive rules and really should be used for friendly games. If it looks right, feels right and is in the spirit of the rules go for it....if not, the agree to disagree but talk it through over a pint in the bar after!
As you can see from my other posts sometimes things do need clarified, but until they are the above method comes heartily recommended !
Hope I've been of some help.