Can you please tell me that what's approach you have taken to delete the row from that table? If you go for Repeating grid, it can be achieved easily.
1) Properly Implemented Scroll bar - You can take a Editable data page and by using report definition you can fetch the data. After that drag a repeating grid in section and make the Data page as a source of that.
Go to Presentation tab, make the Width of content as Pixels(Fixed) and checked the check box below. As per your requirement, make the Height and check.It will give you proper scroll bar without affection the scroll bar for the page.
2)Pop up for deleting row - You can put a delete icon at the last column of that grid. Now in action, on clicking of that grid, please call a Local Action as Modal Dialog. Create a Flow action and section for the same.On submit of that modal dialog, just remove the repeating grid using Delete item. You can delete it using the post action activity of that flow action.
Please let me know whether you got that or any other information needed.