At the moment there is no such plugin I think. But you can achieve this in a relatively easy way using the 'Move Transition' plugin by Exeldro.
In the scene place a text source at the location you want it to start.
Enter the text or use a file to read the text from.
Place a source (webcam, video,...) above the text source, and eventualy another source over the lower piece of the text source (unless the text source is at the bottom of the screen) to hide everything of the text you don't want to see yet. It will be visible when you have the text 'scrolling'. Actually it wil be moving up... ;)
Make sure the text source is the last entry in the sources list!
Now right click on the scene and goto Filters.
Create a 'Move Source' Filter and name it 'TextStart'. You're free to choose another name of course.
Make sure the source it points to is the text you want to have 'scrolling'.
Select 'Hide during movement' in visibility.
Click the button to get the transformation.
Go into settings and assign a hotkey to this filter.
Whenever you use this hotkey, the text is reset to its starting position.
On the scene, right click again and goto Filters.
Create a 'Move Source' Filter and name it 'TextUp'. You're free to choose another name of course.
Make sure the source it points to is the text you want to have 'scrolling'.
Enable 'Transform Relative' and get the transformation with a click on the button.
Move the text source up so that it now displays the next piece of text you want to see.
Get the transformation again.
In the Actions box set 'Next Move' to the filter itself, and 'Next Move On' to Hotkey.
Go to the settings and set the hotkey you want to use for the transformation.
Now set the text source to it's starting position. (We now have a hotkey for that... 1st filter, remember)
Use the hotkey to scroll and check to see if the new line of text is right where you want it.
If the new line of text is higher or lower than intended, open the filter and adjust the transformation's y move parameter. (You can use decimals here)
It might need a bit of fine tuning of the textheight and the y-movement, but the scrolling text is now ready to be used.
You can now add more sources to the scene.
