Sorry for the late reply.
Adding the dynamic load feature was not widely requested since most general use feeds are small.
In your case, there are 60 items. Without “full content” enabled this number is not very huge.
The final output HTML from SRR is crisp and not bloated.
What I can suggest for you is, display all the 60 items and use CSS to add a scroll bar to the container.
Is that fine? If yes, please share me the page URL. I’ll suggest CSS as needed.
This way you can have all the items displayed and users can use scroll bar.