Better random seed (-1) behaviour
Currently if all frames are set to -1, you'll get a random seed on every frame. This is likely not what people expect. Consider replacing -1 with a single random seed, or having a different random marker (e.g. random_value(N) to be able to create multiple fixed random values)
Idea: at the risk of making things over complex, how about allowing an expression around that process? or alternatively, set some generic behaviours/controls like saw/sin with specified range/period, and upper/lower limits? At the moment, you can't because it will interpret -1 as 0 and then the generated seed data will be from 0 to whatever...
Other Idea: Maybe a [RANDOM] in the value column for seed - and parseq can generate a random seed on each Re-Render (rather than leaving it to SD)- but also have a checkbox control which turns off value regen so that once a random seed set has been generated, you can keep that set for multiple re-renders of the parseq set