Would love to see snap tools included in the next version of Impressions.
More styles and tree/landscape blocks would be great.
Something that would be a great time saver as well would be if you copy styles from another Impressions drawing, if you could also copy layers as well.
So if you had a Pave_Fill Layer, you could copy that into your new drawing and the style would come in with it.
Styles can be imported from drawing to drawing. What do you mean by snap tools? Impression has all of the major snaps that would be needed. Look at the bottom lower right bar for a "Osnap" button.
The idea with layers/styles is to have the same layers in all of your DWG files and when you import the dwg, ,map all of the styles to the layers you want. You can save a "template" irf to use for pretty much automatic mapping on import.
Hope this helps,