Revit - Can you schedule curtain walling doors by level?

No

Converting Linestyles from DGN files Microstation to DWG

Active linestylescale (LTSCALE in AutoCAD terms) should be set to 1

Set Line Code Scale to 0.0 in DWG Options. This is the confusing one, if this is set to 0.0, the linestyle used for the DWG drawing will be as it looks in Microstation. Therefore make sure you fit the view first before exporting.

Export to DWG

Linestyles will be set to the length based on the view in MicroStation.

Alternatively, remap linestyles to AutoCAD styles

Set LTSCALE to the scale of the drawing

How to not lose clipped patterns when saving to DWG

There has been a but in Microstation for a while which loses the patterns of shapes that fall accross the clip line of a DGN when saved to DWG. With v8i this is no longer a problem as long as you follow these simple guidelines:

1. Make sure the patterns are associative

2. Make sure the DWG settings are set to Merge to Cell (and not just Merge)

When save as or export is used, the shapes should be recreated as a new shape of shape with the hatch pattern intact.