EBow but that involves holding it instead of picking.

The Planet Waves fat finger screws onto your headstock for more sustain, two of them may do a good enough job

You can get pedals which help sustain.

There's only two ways of 'infinite' sustain which are the EBow and a sustainer pickup, the pickup's the bets option but if you only want long sustain there or other methods ranging from types of strings to types of guitar
Erm, compressors?
Quote by buckethead_jr
I didn't think they had metal in the 1790's

Quote by Guitarislife125
Copper is a metal

Quote by buckethead_jr
Ah, touche.