Thank you all for the comments, especially the ASA rule note.
I did leave out the fact that the level was Adult SP and the home runs occurred on fields w/o fences - hence each player had to touch their respective bases.
Still a tad confused on (3) above - '....(3) Bases loaded w/2 outs and B/R hits a home run and R2 misses 3rd ==> Results: 1 run scores - only R3 from 3rd....'
I do believe that R3 run would count since R3 is not directly involved in the 'force out' as B1 becomes the B/R? Only R1 is affected by the 'force out'? Am I correct in this understanding?
Thanks for the participation.