If you are using G4 when you create map file for remote you have the option to set antirepeat time (200 ms would do). In G3 you have the same thing when you assignee rm button to actions.
If you don't know how to do it, try this plugin http://expertremoteg4.sourceforge.net when you install it make sure that you select option "Plugin sends RC Codes" then load winfast.map file for event maping.