Training Jump Shot for Forwards will train Inside Shot and Jump Range as secondaries ;)
Jump Shot
Guards:
Trains JS @ 2-3 weeks
Trains JR @ 7-8 weeks
Trains HN @ 7-8 weeks
Trains DV @ 7-8 weeks
Forwards:
Trains JS @ 2-3 weeks
Trains JR @ 7-8 weeks
Trains IS @ 7-8 weeks
Wingmen:
Trains JS @ 2-3 weeks
Trains JR @ 7-8 weeks
Trains DV @ 7-8 weeks
Trains HN @ 7-8 weeks
Trians IS @ 7-8 weeks
Also, I have trained Jump Shot for Forwards and noticed pops in Jump Range (as far as I can remember).