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I saw a thread about this a while ago.
Yes Sasuke can handle, and manupilate Senjutsu but he cannot produce his own version of Senjutsu (sage chakra). No of course not as he is shown to handle it quite well, as you said, but he won't be able to ABSORB nature chakra (put sage chakra on accdient so excuse me on that one) as he would do with Naruto's regular ninjutsu techniques.
Think about it logically. Sasuke was able to manupilate and manifest his own technique with Juug's curse seal in which both him and Sasuke are compataible as Sasuke had the Curse seal for years.
You must remember this, because a lot of people do. To have nature chakra in the body you must also have a constant, abundant amount of chakra to equal it so it doesn't take over you. No matter the skill of the user holding the power, if it is too much then you will suffer the effects.
Sasuke would not be able to absorb the large quantities of Naruto's chakra infused with Nature energy (or sage chakra? Fix me If i'm wrong on those terms because I believed them to be the same as Sage mode = sage chakra)