so can't make directly a bridge between VCC (3,3v) and SL pin....
I'm not saying that you "can't" directly connect SL to VCC, but I can't suggest it either. It is very possible that the chip would be OK with that, but since I haven't tried it, I can't suggest it. I do know that if you directly connect it, you will never be able to put it in sleep mode.
Again, if you can spare a pin, you could avoid the resistor and have the option of using sleep mode.
@studioj - look forward to your next version.