STOP...even advise tower that you intend to come to a full stop on runway on initial contact/outer marker.
If it is your intention to stop on a runway after landing for whatever reason, inform ATC at the earliest opportunity. Waiting until you're at the marker means there will in all likelihood be an overshoot for the guy we've just put on the ILS behind you. Nobody likes surprises.
Spacing on approach is adjusted to cater for poor braking conditions on exits, but not for you to come to a stop on the runway.
Share the information please.