Yes, it can BD-R DL. Yes, it have a Renesas-chipset and can´t scan.
I have the BH10LS30 and if writing quality matters it´s better than the LG 14x and 16x with MTK-chipset. However, newer LGs are overall faster.
The actual LG-writers can only scan with special FWs, I crossflashed my BH16NS55 to WH16NS58 for scanning.
These writers are not bad, but more picky with some media.
Overall I would recommend Pioneer-drives, but scanning with it is not possible