Saves and restarts can also be used in the IDE in the GAMS command line parameters box. Entries in that box associate a set of execution time command line parameters with a file that are automatically added to the GAMS call.
The IDE saves any entries in the command line parameter box in the current IDE project. Thus, once you specify the save and restart parameters you will have these associated with every subsequent use of the file provided you're using the right project and have not changed the restart information.