[Feature request] Define distinct config.startupPath

I've been looking around and can't seem to find anything specific on the topic. I am trying to figure out if its even possible to specify a .startupPath based on the file type. For example, if the file-type passed in the URL is 'Image', whether it would be possible to define a config.startupPath specific to images?

The documentation seems to indicate you can only define one startupPath...? Anyone have anymore insight into this?

Your input is greatly appreciated.