Blur Gradients, Effect Gradients
It would be nice to be able to assign effect settings to individual
gradient stops (particularly the blur effect), so that gradients would take
on a greater functionality.
* create a gradient with 2 stops
* stop 1 has blur '0'
* stop 2 has blur '1'
Inkscape would then automatically create an interpolated blur that varied
from '0' to '1' along the gradient vector.
This would be very useful for creating false perspective drawings (objects
become more out-of-focus as they move further into the background).