Use a custom scrapy.Request subclass instead of a meta key

[kmike]

Maybe it could work like FormRequest?

This won't work for #11, but with a custom request class / request creation function the user won't be required to add middleware, dupefilter, etc. to settings; also, API could be nicer.

[pablohoffman]

I like this idea, I think it would make the "javascript on scrapy" feel like a better supported feature. I'd imagine it'll also help for a more robust scripting API (by validating lua scripts at request creation time, for example).

[kmike]

There is now SplashRequest.