Predicative property expressions always occur without a copula in present tense, which is why Value 2 was chosen. They do occur with the past tense marker bin in the past tense, which is not analyzed as a copula here. However, they do occur with the copula bi with future time reference, and, in the Fitzroy Valley variety of younger speakers, also in the past tense.
Another complication concerns the function of stative verbs like stap 'live, stay' or jidan 'sit, be, stay' which could be said to be taking on a copula-like function, as in jidan kwait 'be quiet!' or Wi bin jidan-abat hanggriwan nili fo thri wik. 'We were hungry for nearly three weeks.' (DA98_01_Fladwada.013)
Source: Bennett 1986: 1
Source: Graber 1987: 13
Source: Daniels et al. 2001
Source: Sandefur and Sandefur 1982: 67
Source: Hudson 1985: 100
Source: Angelo et al. 1998
Source: Hudson 1985: 168