I like to run mym12 in vdos along with other programs in side by side mode. Vdos will not allow me to resize it or add a second screen. This is a very important function to me as every month I use my kedit program with monthly credit card and bank statements to check off my entries in mym.
If you mean the vDos window has no handles to resize it by the mouse: I did some experimenting with that in the past. Major complication: The window has to accommodate a certain number of rows and columns (mostly 25x80) of equally sized character cells. The window can’t just be arbitrary sized, only at multiplies of the character cell dimensions times the rows and columns. With mouse dragging it just proved too awkward, jumping from one possible size to the next.