automate 1/32 roll : there is no "easy" way to do it currently, because the sequencer resolution is a limitation of the sequencer, and you can't really go beyond it.
A way to do it is to use the "repeat" automation : if you are at 1/16th resolution and you want a 1/32nd roll, you can add some repeat automation on the notes you want to double. The Repeat automation is quantized ( 1 repeat, 2 repeats ...) What you want to do is use the first value : it will simply play the note twice in the step, hence creating the roll. You can't record it live though, sadly.
Automate FX : the fx automation can't be recorded inside Spark's sequencer, but it can be recorded as a VST parameter automation in Studio One. Arm your Spark track, record in studio one, the fx automation will be recorded.
Reset the kits : you can use the "erase" button to erase instruments, patterns or banks. If you erase a pattern, it will be blank, with no automation or active steps.
If you want to keep the steps, but remove the automations only, you can go to the top panel, open a track, right click on it and choose "empty all automations". It will clear the automations for this track, while keeping the steps. I don't know if there is a way to do it for the 16 tracks at one time, but it can be done for each track one after the other.