Rendering defaults and render options

[kienerj]

I like having rdkit as rendering option in preferred renders. However the render settings used by default and I can't seem to change them are pretty bad in my opinion. There is to much of a margin in vertical space making structures way too small. Example:

The structure could be rendered a lot bigger and get rid of the huge amount of white space. This should be solved in general by changing the defaults.
(Indigo has the opposite problem of too small margins)

On top of this exposing as many rendering options as possible would also be great especially such regarding the sizing of the structures, bond thickness and label size. Right now none of these can be controlled like they can with Marvin and to lesser degree with indigo.