fullresolution and windowresolution ?

I don't see the point. When aspect=false, DOSBox will scale the picture to the maximum window/screen res while maintaining proper aspect. When aspect=false, the image will be stretched over the whole window/screen, even if this results in an "improper" aspect ratio. This is simple and easily understandable. It's not as if DOS had lots of different aspect ratios to offer, after all.

I wonder if "we" is one single person with too much time on his hands and a lack of understanding about how to setup DOSBox properly (; .

Sorry, I don't describe clearly. For example, please look the screenshots :

http://www.mobygames.com/game/dos/space-battles/screenshots

I feel that the Space War screen (Hercules graphics mode) looks
better than in DOSBox. It's aspect factor is 2.
DOSBox use fixed aspect factor = 1.5 when aspect=true in hercules mode.

This option doesn't concern fullresolution and windowresolution (right ?) ,
and can't be redefined by user.

Although Spacewar for HGC doesn't work in DOSBox 0.74,
but works in SVN build.

In my opinion, another game uses different aspect factor looks better.
For example, Rampage use aspect factor = 1.87. So I wish this factor
can be modified in dosbox.conf by end user.

To ADDiCT:

I feel you are unfriendly via your words. I said "we" because I play
old dos games like Spacewar and Rampage with my friends.
Don't you have friends ? Please don't think something evil.
And than, I use DOSBox for many years(v0.58~v0.74). I know how to
setup DOSBox properly.

While I do understand why someone would want to override DOSBox's choice of aspect ratio (accurate or not), the approach has a potential drawback in that some games use more than one video mode. You can always compile your own build of DOSBox, and aspect ratio modifications are very easy even if you don't have much experience in programming.