There really isn't as much control over the pen as there ought to be. We can't easily remove some of the squiggles without damaging our maps or accidentally removing tokens and, for some reason, I can't get the pen to switch colour.
So I have an idea - we expand on the options we have. First of all, we get the colour working.
Secondly, we have an eraser tool - works as the freehand tool except it ONLY removes lines.
Thirdly, player eraser - if they can draw, so they can do some whiteboarding to discuss plans of battle and work out their tactics or just doodle, I'd like to be able to quickly remove it when they're done without damaging any maps I've drawn up. So I'd suggest a player eraser - possibly to tag for certain players (to, say, remove someone's doodling) or all players (to get rid of communal plans once they're done with).
Fourthly, a colour eraser. If we can draw in multiple colours, it'd be nice to be able to remove things of one specific colour.
Fifthly, a line tool so I can quickly draw up non-standard dungeon rooms - not all rooms are created equally. Additionally, a quick and easy option for the ruler that lets me measure walls and not just distance from the center of tokens would be nice.
Sixthly, Size Variation, if only "thin" and "thick" lines so I can draw out things without always holding a felt-tip pen - then I could draw thick lines for dungeon walls and thinner ones for furnishings.
Finally, we can select free formed lines and shapes and move and rotate and resize them but as is, I really don't get why. I'd honestly rather just draw directly and have that removed unless it serves a purpose. My proposal is the option to Tokenize selections so we can quickly draw up a monster, in program, and make that a thing. Otherwise? Get rid of it. It only slows down my ability to scribble out my maps.