It's difficult because of the DOS platform, and because, as usable as it is to us, DOSBox concerns itself very little with user-friendliness, the developers have never looked interested in adding features to improve it. DOSBox even keeps that console, that's a alpha debugging feature.
Of course it's not a bad idea, you just need to find a way to implement it, and consider the cost.
As far as I go lately I have tried to make all the archives I prepared ready for the
drag'n drop method, using batch scripts in the cases where additional mounts were necessary etc.