I'll try that...
Nothing doing. The sliders keep moving and don't give me a choice. The granularity of the expected number of volcanos just doesn't allow for it on this size of map (257x129, 99% = 331 squares. 100% = 0 squares. No middle ground).
So my choices are either to use the in-game painter (ugh) or paint 331 volcanos into the map, then hack the game to make sure it generates them all, so I can be sure that the volcanos I paint actually show up, leading to a very very very volcanic map.
In a pocket region it might be possible (1% of 17x17 = ~2.5 square granularity... so there would still need to be extra volcanoes painted in that situation), but on this map it's just not going to work.
I know the map data itself can support any specific values and be understood by DF. Possibly I could intentionally paint 200+ "fake volcanoes" with 0.99 as their specific value, then Find+Replace that with 0 or something when importing the data... but it seems a very hackish way to get things done. Ultimately it may be what I need to do...
Well, here is a needed feature. Very simple too Ceph.
A [CLEAR] button.
Some way to erase all information and clear everything back to null without closing the program and re-doing all the other maps to get what you need on the one screen you just need to clear out.
I know I ask for a lot, but this program is amazing and there are just some things that I can't do with it, even tho I know they're very possible (like telling the program not to "bend" the output to fit some kind of expected percentage, as an option, or adding a button to clear the whole tab out without wiping out any of the other data).
((EDIT: Nope, this won't work either. The slider sets the amount of squares that will be exported with a value of "100" exactly, letting them be volcanos. If PWDF thinks they're volcanos there seems to be no way to trick it into exporting them as any other value.)
Also, the paint functionality isn't "buggy" unless I use the Large Smoothing brush and push those percentage sliders beyond the breaking point. Using the point brush works fine, every time, but once it goes past a threshold it annoyingly moves a slider or otherwise "bends" the output to fit the percentage sliders again. This is what I was running into with the volcanos.
I'd have all the volcanos painted on there as 1x1 boxes, in precisely the area I'd want them, then once I passed a threshold (99% below volcano, 331 count on a 257x129 map), !!BOOM!! All of a sudden the slider moved and I have thousands of volcanos, which once were Igneous Extrusive layers (seems it grabbed the next closest value for the volcanos, and since there was nothing between 0.7 - 1.0, it said all of that range was 100% volcano territory). Then the program freaks out and turns the slider up again sometimes, meaning that there were NO volcanos.