Hello Damiac!
It is a good thing that you gave that additional information. While I occasionally participate in discussions in the Suggestions Forum, I am not really keeping track of most of what is there, simply as these are not items I care too much about (for instance, I enjoy the original music of the game, so that thread about music you recently posted in is not something I would normally look at). I would assume that there are other people like me who do not have a perfect overview over all forums, but who participate in some forums strongly - like for instance the General Discussion Forum...
Anyhow, since I might accidentally have been part of the crowd you are worried about, please allow me to clarify something: I do like playing using the keyboard. And this is not because I want to get an extra challenge (I turn off invaders, set vampires, werebeasts, secret types to 0 in world gen, put a lot of z-levels between the surface and the caverns), but because I personally find it easiest to play the game using a keyboard. I am not very agile, and using mouse control can be very frustrating for me when I want to be very detailed in what to mark or where to click. Besides, I can't envision a feasable and easy way to structure the complex content of the game in such a way to have an easy-to-use menu/window structure that would allow the mouse to really show its potential.
For all these reasons, things like mouse support are not something that makes the game easier, but rather more difficult should they become mandatory. And that is where I speak up. I don't mind if people want to play using the mouse. I think it would be great if the game gave them the option to do so. But if in doing so, the game denies me the possibility to continue playing using the keyboard or making keyboard playing ineffective as compared to the current state of affairs, I can not agree with the proposal. Mind you, I wouldn't care if mouse support was the default (which it actually currently is, for its limited use at the moment), as long as I am able to turn the mouse off (which I currently do) and play the game in the manner which I find easiest.
Putting it simply, if you let me play the game the way I like to play, I have no problem with you playing the game the way you like it.
Yours,
Deathworks