[huttdes]

Thank you. I will look into Texturecache.

As for the actors. If I would decide to go with a central folder would a local one take precedence if I decided to do so?
Meaning I put all my actors in a local folder then decide I would like to do what I mentioned with select movies and have an actors folder in those movie folders. Would Kodi prioritize those when scraping or is it a one or the other thing?

This gets a bit messy, but MC doesn't shift the actors around. You'd need to delete all the .actors folders and rescrape the actors into the central folder from fresh.
This is due to the naming of these actors images, as well as loading the actors images url path to their new central folder location.

As for the actors by year thing I think it is something that could actually be done it there was enough interest and people got involved. I mean movies in the last 5-10 years would already be fine for the most part. Then if you acquire an actor image from 1980 for example that image could be used for a few years of movies from that timeframe. I'm sure the sources are out there with Google, then and now websites comparing actors and so fourth. Or maybe its just too much effort... I'd say at the least I'll do this for some movies in the future.

This is a good thought, but would require a new website for hosting images, storing them in a database with date of image or age of actor/actress also with their year of birth, so there would be some way of calculating what image you need for a particular movie they were in.
Not impossible, but a bit of work.
Plus getting a location to Host these images, ensuring there is no copyrite infringement etc. Yikes....Thought about this too much. 

Well, you just made that sound more complicated than I thought it would be :-(
I was thinking just a database with a folder for each movie and you would acquire them that way and replace your current files.
I guess I'm getting in over my head here...