If you find that you need rectal meds nightly (or anything more than the twice a week "standard" for use in remission that I found in some literature) to maintain remission, I really don't think it's any big deal. It's what YOU need. To me, remission means that you are not having symptoms and are not on pred.
If you don't like being on rectal meds that much, you could try upping your Lialda dose to three or four to see if that helps. I am on four Apriso daily (the maximum dose). However, it is a lower amount of mesalamine per pill than Lialda.