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3 - backbuffer="true|false|mask|filter"
4 - filters (filtering of a group must be performed AFTER the group is assembled)
5 - arbitrary alpha channeling
6 - DirtyRegion needs to use microtile arrays
10 - text-along-a-path using readback from path attribute
11 - non-hairline lines as stroke-to-fill conversion
12 - includes mitre, bevel, and bump joins
13 - dashed lines as intermediate conversion
16 - subtree sharing? otherwise the memory consumption might be outrageous... clone="" attribute?
17 - faster gradients and patterns:
18 - transform each corner of the trapezoid and then interpolate
19 - bilinear transforms?