Set your preferences via Scripts -> Unique Replay Name. In this window, you can toggle replay name replacements, and set your preferred replacement mode. If counting mode is activated, additional options appear.
Please set your replay name and the counter before starting to record replays because the settings don't save yet.
hit S (or your custom hotkey for saving replays) to automatically set a unique replay name.
choose between two modes:
Counting Mode: Set a replay name and use a counter that ticks up every time you save a replay with this method.
Time Mode: Adds the current time to the replay name
No saving yet
The source code for this plugin is available here.