The sim is a great controlled learning environment but it's not a substitute for the real world. No matter how much they try and cram in the syllabus you're just not going to be a seasoned pro after 8 sims. All the sim does is make you safe enough to fly the airplane under the supervision of a check airman. Your IOE will "fill in the blanks" and cover a lot of things they don't have time to cover in training like using the radar. For now my advice would be don't pester your sim instructor with questions about things that aren't in the syllabus, worry about passing your checkride and the rest will come later. You'll have plenty of time to play with the wx radar once you get online.