since FT does have impact on salary, I think it is affected.
since FT has only small impact (compared to other skills) on salary, I think the best time to train FT is just before he reaches his cap. You probably get a few more levels of FT before he hits the cap that way...
But I'm not 100% sure. I would just find this logical.
If indeed you would ask to train only 1 position he would need to play PG.
I was thinking in terms of my training regime, and then you could train the taem on pressing, and then he could play anywhere. Ofcourse that's a slow proces...
A middle solution, yet still slow, would be that he plays SF, and he trains PG,SG and SF on pressure. It's a training I use a lot, but I don't train for NT's ofcourse. I imagine it is too slow for NT players...
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