Archon’s mapper can do this, if you can find it. It’s no longer supported, though.
JOverseer does this also. Find the Map Editor section and you can hack around with it (note: Right Click on hexes or Hex SIDES depending on what you’re trying to do…)
Actually I figured JOverseer out and have been merrily scribbling over things ever since, not to mention knocking down mountains to improve the view, and erecting interesting signs describing gamers I have met Actually I’ve been plotting known locations of dragons and have early on come to the opinion that they just go everywhere in the Misties, some stick to the mtns, some spread as far and wide as the H&R outside the gap of Rohan. Still, it’s fun drawing pictures. I’ve made a join the dots of those dragon locations which looks something like my 3 year old’s art projects. I’m going to branch out and make a frog out of a rock shortly …