If I assume you're meaning intensity for ethash, you use --eth_config=Axyz where xyz is a number between 0 and 16 x Compute Units available on the gpu. For a 470/570, the range is 0-512, 480/580 0-576, Vega 56 0-896, Vega 64 0-1024, Navi 5700XT 0-640, Navi 5700/5600XT 0-576, etc.

The first char also denotes the "mode" we're using. It doesn't matter for most gpus atm, it's mostly for the Radeon VIIs these days. You can see what mode the auto-tuner chooses for you in the stats output every 30s and use that as a base. Lower the number to decrease the intensity. What gpu type are you looking to control the intensity for?

For fan control, you add --fan_control to enable it. For a single gpu, you can just add a custom config directly with the same argument: --fan_control=45:::50 would be "keep core temp at 45C, start the fans at 50% of max". If you have a gpu with mem temp sensors (check the stats output if there's any value reported in that column or not for the gpu), you can rather use that temp as the target: --fan_control=45::70:50 would add the condition "...also keep mem temp <= 70C" to the previous example.

Can I set cclock, mclock, cvddc, mvddc with this miner or do I need extra tool for that?