I know you've now got to consider the possibility of them failing to get to the FO target, but I think we'd be stupid to enforce on. Bird and Fidel have done a lot of bowling in this innings, so doubt would benefit from a rest. Crane has taken four wickets on day two, so just think what he might do on day four if given the chance. And our batting is so frail, that even if we were set a chase of just 120, you would worry.
Meanwhile Worcs are 2 down, still 52 behind. And hopefully Sussex will be bowled out shortly.