Donovan again impressed after coming off the bench by finishing powerfully and then setting up the fifth for Rodwell.
It was United States international's final home appearance before returning to Los Angeles Galaxy and Moyes conceded hopes of extending his 10-week loan were slim.
He said: 'We would like him to stay but it looks like he is going back to America.
'We respect that and don't have a problem with it, but he has done well.
'I think we and Landon would be keen but he is here for the Birmingham game next week.
'Maybe there is a bit of time to see if anything can be done but, if not, you could see what the supporters thought of him.'
Moyes revealed he lost count after his side ran out convincing winners.
The scoreline could have been even more emphatic as a host of other chances were passed up.
Ayegbeni Yakubu missed a penalty, hit the post and put another good chance over the bar while, among other opportunities, Victor Anichebe had a goal disallowed.
At full-time Moyes was convinced his team had scored six and had to be corrected in his post-match Press conference.
Moyes said: 'I thought the players played really well and to score six was very good.'
Moyes then joked about how a radio reporter had told him the team only scored five goals.
When it was pointed out five was indeed the correct score, Moyes said: 'I'm sure it was six. I'm delusional!'