It would be nice to be able to scale up without bilinear blur or nearest neighbor artifacts without 3rd party utilities adding lag/framepacing issues or buggy driver-based integer scaling.
You can already do this.
On the first page of the control panel under "Appearance" you need to set "Scaling mode" to "Stretched, keep Aspect Ratio" (or "Stretch, 4:3 Aspect Ratio"). This is necessary to let dgVoodoo handle the scaling.
Next you need to right click the General/Glide/DirectX tab row and enable "Show all sections of the configuration".
Go to the "GeneralExt" tab. Sharp bilinear scaling is simply integer scaling to the highest integer, then using resampling the rest of the way. So set "Integer scale factor" to "Max available" then set "Resampling" to "Bilinear". Though you might prefer Lanczos (but then it's not "sharp bilinear scaling").