Hi,

Please refer to the code below:

__Manifest__.py

"depends": ["sale_management", "mrp"],
"post_init_hook": "post_init_hook",

__init__.py

def post_init_hook(env):
    """
    Post-init hook to automatically enable the 'Multi-Step Routes' setting
    by activating the corresponding user group.

    This function is called after the module installation. It ensures that
    the 'stock.group_stock_multi_locations' group (which enables the Multi-Step
    Routes feature in Inventory settings) is added to the implied groups of
    'base.group_user', making it active for all internal users by default.

    :param env: Odoo environment with superuser privileges.
    """
    group = env.ref('stock.group_stock_multi_locations')
    base_group_user = env.ref('base.group_user')
    if group not in base_group_user.implied_ids:
        base_group_user.write({'implied_ids': [(4, group.id)]})

Hope it helps.

You can inherit res.config.settings model and create all the configurations you want.

Example: 

class ResConfigSettings(models.TransientModel):

    _inherit = ["res.config.settings"]

    max_product_registries = fields.Integer(

        string="Max Product Registries",

        default=5000,

        help="Maximum number of product registries to be updated at once.",

        config_parameter="your_module.max_product_registries",

    )

    product_manufacturer_update = fields.Boolean(

        string="Auto-Update Product Manufacturer",

        default=True,

        help="Choose if the products need to be updated with the manufacturer information automatically with the cron action.",

        config_parameter="your_module.product_manufacturer_update",

    )