If you just replace the pointing cursor in a system set, yes it will reset. You actually have to have a folder in the system cursors folder that has the new or duplicated cursors with new set names. Create an entire set and save it with a name that u give it. U can use system cursors but must duplicate them and move the copy to said folder for use in the set you create. U need Admin privileges to create a folder and add cursors to a system folder/file. U can't just keep a folder of cursors in the download folder and then pick from there to replace a cursor in a set, for example. Hope that helps you.
This a collection of many cursors & colors. Check it out, you may find something you like.
It's good to note: Many cursors appear differently against light & dark backgrounds. I have found that, surprisingly, those I thought would look best in a light background looked even better in a dark one. Go figure. As well, I have collected & made many cursor themes but the one I use most is a hodgepodge of cursors with no theme scheme at all. A bunch of fav's in one place.
<08.01.'16 Added 5, compass rose, Busy cursors>
<11.02.'16 Added Transcend.ani & 4 swirl busy cursors>
<08.04.'16 Added Dragon.ani & Digit.cur>
<11.04.'16 Modified plankton.ani to include both sizes [32,48] & enhanced the image quality.>
<04.05.'16 Added some cursors. Something different.>
*<29.05.'16 Added some more cursors.>
<30.9.'16 Modified & enhanced Plankton cursors>
Have fun & enjoy!
Note: Periodically I will be modifying sets and cursors to included both sizes [32,48] & image quality for higher DPI modes.
* These are some samples I've been working on. Soon, there will be full/complete, themed sets. Enjoy!