Is there way to force Dosbox to run games in Fullscreen? Because some games I have for it, it launches into a stupidly small, non-resizable window and its kind of getting annoying. So if anyone knows of a way to force dosbox into fullscreen, please let me know. Thanks!

If I remember correctly pressing ALT+ENTER switch from windowed to fullscreen mode.
EDIT: Well I DO remember correctly it's ALT+ENTER to switch fullscreen on/off; I just tested with GoG's Duke Nukem

You are a genius sir! A gentleman and a scholar. May the gods shower you with beautiful women and chocolate!

You can make DOSBox enter fullscreen automatically by editing dosbox.conf and changing fullscreen=false to fullscreen=true. If you want to play in a window but with a bigger size, go down to the [render] section and set scaler=normal2x or scaler=normal3x.
If a game uses its own conf file you will need to make the changes there instead.

Or also edit the shortcut and add "-fullscreen" at the end of the command line