Hey Brett, good to hear you're out there having fun somewhere. You're probably making a good choice avoiding code!
The fact that people are commenting on the FUSED! proposal--and even beaming messages from retirement--is indicative of...something. Probably that Rebol notation simply leaves a lot to be desired. 
Rebol's PARSE isn't the only game in town for people looking for alternatives to RegEx, and I've talked about how parser combinators in languages like Haskell offer a quite a lot...with tons of infrastructure to assist in real world tasks.
So before trying to extend the syntax of Rebol's medium, I'd side with the idea of shoring up PARSE when you're not trying to use it to mix full-on representations from different languages in the same source file. Until that really demonstrates "bringing the magic" reliably, then getting entangled in syntax extensions for LOAD just adds other layers of complication.
@BlackATTR brings up the Whitespace Dialect and I think that really hitting home-runs on problems like that is a prerequisite to getting too much further out in ambition.
I think FUSED! might be able to be a relatively low-cost way to get a little more satisfaction for people. Little things like that and COMMA! may help get closer to a sweet spot where it feels "flexible enough".
The question of how to make the evaluator "hookable" is definitely on my mind. One big step of this has been trying to make FRAME! a very reusable part...and to unify services across PARSE and plain DO for things like single stepping and debug stacks.
And yes, all of this is hard...as my notes show. It's especially hard when it's all on the backdrop of a weird dependency game where you're writing it all yourself in C89. 