Thank's Genete, you're being very helpful as always.
So, just to collect my thoughts here, disconnecting the channel does basically just flush the waypoints that are in the timeline? If I change blendmode after I've disconnected it I get new waypoints added?
To change value without having it animated the only way now is to switch to non animation mode before changing blend and then switch back to animation mode after I changed value?
I will forget to switch and end up with a mess but it's a minor problem, easily solved.
Basically what I would want is a per-channel animation/non-animation mode. I'll add a feature req. about this later.
In your particular case, the blend method is not usually animated (unless some special effect is going to be achieved) so you should not start to animate until you have clear the initial design (and the parameters that will remind not animated).
The thing is that I know which blend modes I wil use for final output but want to switch between different ones while working and not have this animated.
I've got a few layers with different blend modes on top of an image sequence. Final output will be without image sequence so I'm switching the layer above it between composite to see how output will look like, and multiply to see how animation match up with image sequence.