Yes, there is a way to get the option to roll manually: Use my framework instead!
Seriously, you are given prompts for all rolls (to hits, damage, etc) including saves. The box will be pre-filled with a MapTool-generated roll for those who don't
want to use physical dice. Of course this can be overridden with your own value. Most importantly, it easily converts Rumble tokens in seconds so you may want to give it a whirl (the link is in my epilog below).
Interesting! I'll have to give that a try. If I'm setting up a new campaign that has never used Rumble before, is there anything I should know? It looks like a lot of the documents presume that you're coming from Rumble's stuff.
Secondly, does it work well in the tabletop environment, where you're not tracking powers with the Framework, and only use it for HP tracking, Initiative, and Condition tracking? I think my players will want to continue managing their characters on paper, as that's part of the D&D experience.