...change the "photopost" directory default name?
 

I was wondering if it's possible to change the default directory name of "photopost" (domain.com/photopost), to something else (domain.com/images, domain.com/photos, etc.)?

If so, this would be great. I tried to change a few files but it appears as if the "photopost" directory is built-in to the program?

Sure can be anything you want.

I by default install photopost to a directory called gallery

1. Simply update your global options to the new server paths and urls.

2. change the directory name

3. edit the config file and change the server path there as well

You should be good to go