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WRF Chem v4 user guide

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Unfortunately there is not yet an updated user guide, however, most changes between 3.9 and 4.2 have been modest - at least on the chem side of things. You can see a list of documented changes here:

and chem-specific pull requests here:

We will be working on putting out a new user guide soon - Is there something specific you would like to see discussed?

I was curious about the changes in namelist options for &chem for v4 and above. For eg. there is a new dust_opt = 13 for MOSAIC, which isn't documented in user guide. Similarly, there may be others as well. Want to know about these.

Also has this fix been implemented yet:
It says approved but is not shown in I don't have much knowledge in github yet.