This mod is very simple, and you can configure any amount of blips you want.

Here's how to add a blip:

Create a new .txt file with the name of your blip.
Edit the text file using the following format:
X, Y, Z;Name;Sprite

The X, Y, Z values are the coordinates of your blip, this is where your blip will be located on the map.
The name is your blips name, you do not have to make it the same as the .txt file name.
The sprite value is optional, if you do not want a custom sprite, just leave ";Sprite" blank.
List of sprites can be found in BlipSprites.txt

To remove a blip, just delete the .txt file.