Because no one want to answer my questions I had to figure it out myself.

1. Stars - you can bring back general's stars by simply copy/pasting GenStars.bif from the original MTW's campmap folder. Cegorach replaced it with a blank, transparent file.

2. Stacks - this is much harder if you want to keep new army pieces. Repainting of all army pieces is needed. However, if you are not a big fan of a new stacks' graphic, you can replace them with original ones too.

I really don't understand why Ceg done this. One of the first building you need to build (for further development) is a border tower (1 turn). After it's built there is no point for "hiding" opponents armies because tower shows everything. IMO "hiding" feature only generates unnecessary clicks.

btw in the meantime I replaced my assassins with robin hood. I've been thinking about joan of arc but she will better suit for crusades.