I'm sort of what you would call a small developer and WordPress jobs are the majority of my business. I'm speaking only for myself here but when I see stuff like this I pass:
RewriteEngine on
RewriteCond %{QUERY_STRING} ^_escaped_fragment_=(.*)$
RewriteRule (.*) http://crawlspa.com/s/%1 [P]
I understand what you're doing, but there's something about writing redirects to relatively new 3rd party sites that make me uncomfortable.