I have questions and a suggestion,
First, what is the scale of the hexes? It's hard to determine how long it takes to get somewhere when I don't know how far across a hex is.
and
Some tips on what the settings mean would be helpful. For instance what does "Biomes placement" under Hex Map Generation Algorithm do? And what does the probability multiplier do? Maybe having a percentage might be more understandable? Depending on just what it is doing of course. I'm assuming it's a multiplier of a base percentage chance? Knowing what that chance is might be helpful.
Second, it would be nice if there was a re-roll button for a given section. That way if it generates a hex, an Inn, a dungeon or dungeon room etc. you don't like you could re-roll it.
Aside from that this is an amazing tool!