Cumulative ModVals?

I'm making a couple super jump oüft plugs for the EV Classic Nova conversion, each having multi-jump capability, lowering the distance needed before jumping, and lowering the amout of days in a jump.

My question is: will these outfits be cumulative in those ways?

Examples:
One of my two outfits has a multi-jump of 2, and another of 3. If I have both of those, will the multijump be 5, or will the 3 overwrite the 2?
Will a modval of -200 for distance before jumping overwrite or be cumulative with a modval of -300?
I'm pretty sure that lowering the number of days is cumulative, judging by the Alluvial Dampener in Nova, but will having a total of 3 days less cause a problem since that could make it -1 or -2 days? I don't think so, but I'm just checking.

I'm asking to see whether having both of these outfits will cause problems.

Thanks.

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Whatever you do, you can't go below 1 day per jump, states the Holy Bible. Now, if effects stack or not depend on the modval; you can assume most do, but I don't think multi-jump does (it's not "increase number of jump at once by 9" but "allow for 10 jumps at once", I fear...) Not that I've tried, though. No-jump-zone radius decrease can be assumed to be cumulative, since each one states it reduces that radius by that many pixels. The same way (might) go for the alluvial dampener-likes (each one reduces jump time, or even increase it, by some time). I think the best way to know is testing, like for everything plug-related.

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