In before "learn VB6 dumbass", that's not the point of vbGore.
i'd like to address that line first, because that is
the point of vbgore. it's an engine. a framework. not a complete game. you need to get in the code and change things to work how you want them to work.
spodi has already explained why things are the way they are, but zanval just touched on something as well.
lets say you want strictly keyboard control and vbgore was coded only to handle that with no mouse support what so ever. someone who would rather strictly mouse control would have much more work implementing it and most likely be turned off from vbgore.
a while ago spodi explained why most of the features coded in are the way they are. everything is done in a generic non game specific way (character control/movement is game specific and subject to personal opinion). this means if there's something you like, the groundwork is there for it to be easily expanded on. if there's something you dont like it's still easy to remove.
to keep with the character control example, if you want your game to have only keyboard input, the groundwork is there to easily do that with only minor code modification. if you want only mouse control, the groundwork is there to do that with, again, minor code modification. if you want a mix that is just different than how vbgore handles input by default, the groundwork for both is there and can be done with minor code modification. you see what i'm getting at here?
the same goes for the /accept command. you may want a specific type of quest interface while the next guy wants something entirely different. only the core functionality is there so that you can build on it in any way you wish.
the more specific any feature of vbgore becomes, the worse of the engine is as a whole. you're not dealing with something like rpgmaker where certain core mechanics only work a specific way. with vbgore you can, and should, modify everything to fit the way you
game to work. it's not meant to have a few graphics dropped in to it and call it a day. it's open ended so everyone who uses it can go in drastically different directions.
for the record, i think the default combat controls are fine. WoW works in a similar fashion. select a target with your mouse(cant trust tab targeting all the time) and use the keyboard to use skills.