I just checked, apparently Flexi 8.5 don't have that feature. It has a multitude of settings that can be used for color adjustments, but nothing called "rendering intent".
No. If the RIP is Flexi then rendering intent is involved unless color correction is turned off. Even then I'm not all that sure that rendering intent is bypassed.
I'd like to know how you're printing directly from Corel as well, as that would save me a step. In almost every instance, I'll take my Corel file and convert it into a .jpg, then import that into Flexi and print from there. I haven't had any instances where the color was screwy, and I use a lot of Pantone colors. A caveat, though, you'll need to play with the output profiles until you get a setting that works. I outputted several Pantone swatches and played with the profiles until they very closely matched.
Why not skip Flexi entirely and just use cutting master from graphtec to cut? I've completely abandoned Flexi in lieu of Cutting Master driven by Illustrator. I was a diehard Scanvec fan for a long time and I can't be happier not using it now.