Well here's something I didn't know till today!
I was a little annoyed that the image/effects editor was removed from Sense 5.0 Gallery. Instead, just a few presets under the effects menu.
However, you can edit those effects!
Hold and drag an effect to edit it. Here you can tweak the desired effect, as well as add more effects, including effects that aren't listed under the presets (contrast/brightness/exposure and so on).
You can also create a new preset by dragging and editing the "No Effects" preset in the editor. So I created a preset with every effect added (at the default values, so as not to apply any effect when first selected). Then, save this preset with a name of your choice. The reason for creating a preset that does nothing, but has all effects active is so I can now use this preset to edit every aspect of my image easily. So, for example, I want to edit the contrast of an image. Drag the custom preset to edit, then edit the contrast, click "done" (not save preset). You'll see that it does add another preset with your current settings, but this is only temp. Save your image.
Now, if you back out of gallery, then back in, edit an image, click effects, that temp. preset is gone, but your custom one is still listed. So to edit another, just drag your custom preset to edit and away you go.
Also, effects, frames and the like can be rearranged by dragging in the editor.