Copied some of SEP-019

GSoC-2014.md

@@ -36,7 +36,27 @@ which should encourage more writing more (and better) extensions
 **_Pablo to write a new SEP document._**
 
 ### Per-spider settings (SEP-19)
-https://github.com/scrapy/scrapy/blob/master/sep/sep-019.rst
+
+This is a proposal to add support for overriding settings per-spiders in a consistent way.
+
+In short, you will be able to overwrite settings (on a per-spider basis) by implementing a class method in your spider:
+
+    def MySpider(BaseSpider):
+    
+        @classmethod
+        def custom_settings(cls):
+            return {
+                "DOWNLOAD_DELAY": 5.0,
+                "RETRY_ENABLED": False,
+            }
+
+**What this solves**
+
+* support true overridable per-spider setting, from both command-line usage and library mode
+* support for accessing settings from spiders (currently not supported without hacky code)
+* avoids mistakenly believing you can change settings after they have been populated (you can, but they won't have any effect)
+
+More details and some implementation proposals can be found in https://github.com/scrapy/scrapy/blob/master/sep/sep-019.rst
 
 ### Better generator support
 Mikhail: