Try another flavor of marmalade, such as pineapple.
If you have time, brown the pork in oil on all sides before placing in the slow cooker. Browning adds color and a deeper flavor.
Watching your salt intake? Omit the salt, and season with pepper.
This is a great recipe to serve for entertaining. Fan pork slices in a circular pattern on a platter, and spoon squash in the center. Drizzle remaining juices over pork, and garnish with slices of fresh orange.