I've only used it very briefly, so some of the things I'd want, might already be there, and I just didn't see them.
The biggest issue I have is the GX corner. I'm a gamer, but that doesn't necessarily mean I want to see some random game news (not to mention the daily news...) when I open my browser. Please add an option to disable it, or at least have it not default to it when I drag out a tab to create a new window. Also, being able to start out on speed dial would be nice.
My second annoyance is that the GX control panel is only available through the sidebar (at least I didn't see it anywhere else). I really don't like the side bar being on all the time, and having to enable it through the settings (or even the easy setup) when I'd like to limit my RAM/CPU usage would be a pain in that one lower body part. Add an option to open the panel from the menu. Or better yet, have a small button to toggle the sidebar on and off. Ideally, both. Oh, and it makes noises, even though I disabled the browser sounds. Hopefully a bug, and not a "feature".
I like the look of the browser but... It's a tad too dark for my taste. Not sure how possible it is, but an option to customize the color would be appreciated. The tabs could use some more contrast too.
TLDR: Just add some more customization options! The CPU/RAM limiter pretty much sold it to me already, polish it up a bit and at least add an option to get rid of the GX corner and I'll gladly switch to it.