2. Because it doesn't conflict with mods, that use their own SKSE.ini file, since it edits the file, instead of placing a new one3. In case of new Skyrim version you only have to run the patch again4. If you overwrite SKSE.ini with some mods or new SKSE version, executing patch...
Name: Skyrim Legendary Edition Short name: skyrimle Nexus ID [optional]: ID of the game on Nexus (you can usually find this in Nexus URL). Executable: TES5 Launcher [optional]: Skyrim Launcher Data path: D\Skyrim - Legendary Edition Documents path: C\User\My documents\My games\Skyrim ...