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i guess components like stratix_lcell or any other one from sim_lib are just for having a precise simulation and not implementation of logic
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I think you're wrong in this point. If you look to the Quartus provided primitive libraries, you have simulation (in folder eda/simlib) and synthesis (in folder eda/synthesis) variants. The stratixii_lcell_comb primitive, that's used in some cookbook arithmetic examples is from the latter. These low level primitives strongly depend on the respective FPGA family structure and are, as fare as I see, partly undocumented. You possibly can extract some information from the corresponding simulation libraries.
Personally, I didn't yet need to use core primitives in designs, so I fear, I can't help you with detail problems.
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