It was a intersting choice to let the film interpolate some of teh Fanny Brice standards (My Man, I'd Rather Be Blue Over You, and about half of Second Hand Rose which Streisand had recorded and had a minor hit with) but I think they hurt the movie.
Streisand does not sound like Fanny Brice and these songs are at odds withe the Styne/Merrrill pastiches. If you are doing the Fanny Brice story you either write a new score or use all her originals.
The movie FUNNY LADY used mainly older songs with a couple of new ones by Kander and Ebb, and it doesn't work. (The movie is a bloody bore too!)
Cast albums are NOT "soundtracks."
Live theatre does not use a "soundtrack." If it did, it wouldn't be live theatre!
I host a weekly one-hour radio program featuring cast album selections as well as songs by cabaret, jazz and theatre artists. The program, FRONT ROW CENTRE is heard Sundays 9 to 10 am and also Saturdays from 8 to 9 am (eastern times) on www.proudfm.com