@shaun He seems to be implying it will eventually be possible to use Javascript on custom engines... I hope this is accurate... This would be huge for engine creators...
@Sven Even if it was a one-time payment for "Javascript support edition," it would be worth it. So many sites I post to are switching over to the new "invisible recaptcha" Javascript which GSA doesn't currently support.
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As @seoaddict said even if it's an additional fee or unlocks for custom engine use if you have a SERE subscription it would be worth it.