Thanks! The original goal of this was to make printable maps really easily, so I haven't focused too much on interactive stuff like character tokens or fog of war. However, you can easily add your own stamps (there's a button at the end of the list, or if you click the current stamp, there's a big button on the popup), and stamps are easy to drag around, so that could be a solution for you there.
In regards to the dice, do you mean an actual dice roller, or just stamps of different dice?
This looks to be a mapping tool rather than a full virtual tabletop. You could use this to export a map and use it with roll20 or foundry or a big printout or whatever you like.
Well, as with all projects, the scope has creeped a little bit already, so I won't say never to that! It's definitely something I could be open to adding in the future, if I can think of a good way to fit it in with this tool.
In regards to the dice, do you mean an actual dice roller, or just stamps of different dice?