Spam Hit Threshold - Integers Only?

[AngryKid]

I tried setting my spam hit threshold in Plesk to 5.5 and it said it's "Not a Number". It appears it does not accept decimals. Is this correct?

It would be nice if one could specify decimals.

 

[alex042]

Spam rating is not an exact science so adding a decimal likely won't change filtering enough to notice much.