QGIS » QGIS Application

I'm not sure where to begin here - there are probably multiple tickets in this filing, but I thought I'd file a massive ticket & await further instruction.

Screencast of my experiences: http://www.screenr.com/ltl8

1. Grid Extent Section

I have no clue how to tell what is required, what is optional, or what the extent tool uses for input in the case of conflicting entries.

For example, if I select a layer, and then click on the "Use Canvas" extent, which one is used? Or... why is the first thing I am asked to complete in this UI possibly immediately ignored?

Why is there a checkbox for a raster layer at all? Why wouldn't a vector layer and a raster layer work the same way? Also... why does it discuss "resolution" in the "extent" section?

1. Parameters

The title here is very vague and not helpful. Perhaps "Grid Interval" is a better description?

And, if it's possible to show some knowledge of the units for the Grid interval, that would be fantastic.
The grid interval should also be set to default to something related to both the units and the grid extent. For example, the default unit is .0001, which, in a Web Mercator projection (or even WGS84 with a multi-degree extent), will bog down most machiens while trying to create an extremely fine grid.

"Lock 1:1" is not very helpful (as compared to a maintain ratio lock once a ratio has been set), as 1:1 is the easiest ratio to manually enter, while 2:3 can be a little trickier, etc.

The "Output Grid as" selection also repeats information that deemphasizes the comparison at hand: lines vs. polygons.
Perhaps it could be changed to:

"Output grid as: _ Polygon _ Lines"