Call Waiting:

call_waiting.enable="0" - Disabled
call_waiting.enable="1" - Enabled

Call Waiting Tone:

call_waiting.tone="0" - Disabled
call_waiting.tone="1" - Enabled

Remove DND Button:

features.dnd.allow="0" - Disabled
features.dnd.allow="1" - Enabled

Headset Mode:

features.headset_mode.enable="0" - Disabled
features.headset_mode.enable="1" - Enabled

Ring Headset and Device:

features.headset_mode.enable="1"
features.ringer_device.is_use_headset="2"

Disable Voicemail Notification:

features.voice_mail_popup.enable="0"
phone_setting.mail_power_led_flash_enable="0"

Ring Volume:

force.voice.ring_vol="1-15"

Missed Call Notification:

features.missed_call_popup.enable="0"
account.X.missed_calllog="1"
phone_setting.missed_call_power_led_flash.enable="0"

BLF PICKUP:

features.pickup.blf_visual_enable="0" - Disable
features.pickup.blf_visual_enable="1" - Enabled - Turned on by default

Intercom/Barge:

features.intercom.barge="0"
features.intercom.allow="1"

Turn BLF into Intercom Keys: 

(This will remove the BLF PICKUP option)
features.blf.intercom_mode.enable="1"
features.intercom.mode="1"
features.intercom.feature_access_code="*71"

Intercom Key

features.intercom.mode="1"
features.intercom.feature_access_code="*71"
programablekey.1.label="Intercom"
programablekey.1.line="1"
programablekey.1.type="14"

Intercom Prefer Speaker

features.intercom.headset_prior.enable="0"