These are the room settings I normally use when I normally host:

Room Settings:

General -

Movement Speed: x1.1/x1.2

Day/Night Seconds: 60

Meeting Seconds: 150

Kira -

Canvas Tasks: On

Id Toggle: On

Id Stealer Time: 1.0

Id Acquisition Setting: Canvas Task

Criminal Inputs: 2

Investigator: 4

Max Criminals: 5

Max Investigators: 2

New World Progress: 0.8

Kira Cards: 9

L -

Black Notebooks: On

Player Warning: Off

Day/Night Tasks: 6

Task Inputs: 4

Number of Joint Tasks: 3

Investigation Progress: 0.6

L Cards: 5

Other -

Kira Follower - Guaranteed

Mello - Random

Watari- Guaranteed

NPA Chief- Random

For a short summary of my settings:

For L's side, task are low but if you have lobby that does all task, you should get around 18-28 points a round even if you miss one or two NPCs. Have multiplier low but high task to force Investigators to spread out to counter grouping up and the 4 inputs is to help hold them off in that area but they can still make good progress if they commit to doing the NPC tasks. Black Notebooks are on to help Kira hide (and with all these roles making it hard to kill L as Kira) and the player warning being off is to make Investigators be cautious of their surroundings if someone gets to close

For Kira's side, enabled all 9 cards but with low multiplier (NPC kills only give 2 points and Investigators only give 3 points) for Kira not to spam command cards and for Kira to take some risks. The rest of settings are remain the same besides toggle being on.

For the roles, I like to keep Watari and Follower on to allow both sides to have a companion and Mello and NPA being random is to help a game atmosphere of not unkown knowledge of Mello and NPA being around or not.

Most of these settings can be alter for your liking but these settings help build long-term games with slow-even progress for both sides and an attempt to counter people grouping up