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You could make your own.
The simplist one would be to use a small cube say 1-1.5 cm with normals pointing inwards and the front face removed.
Apply an emitter to rear face and matt black to the others. This is the setup we used in Indigo and it worked well. I guess you could make other flash geometry like rings etc if you wanted. Because the meshes are small I suppose Otoy could hard code them in the future however currently making use of instances you should be able to insert and position them as you want.
HTH
I would guess I would use the bloom - lens flares not so much, it should be used pretty moderately anyway, it's like when lens flare was introduced to photoshop and then everybody lens flared everything - gets old quick
And definitely white balance is the most useful..
The flash option - yeah it was promised a long time ago.. well, I don't even know if I would use it that much, not sure - I guess it could be hardcoded - a plane light emmiter behind the camera, with adjustable size and distance of the plane from camera - still I could see how it could speed up workflow when modelling a fresh object, and from there on there could be a two or three point light setup also embedded, or a soft box instead of a flash
Definetely a good move to do more work on post processing - some lower quality rendering engines pull of a lot more by using post processing inside their apps - like marmoset toolbag
