A Palestinian "unity government" would be a united Palestinian Authority. Big deal. The only organization that is able to negotiate with Israel on final status issues is.... the PLO, not the PA. So it really doesn't matter whether (or not) Hamas are part of a PA coalition. Ergo, they will be under no obligation to do as you suggest should they become a part of such a coalition.
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Preliminary report: Shooting attack in East Jerusalem's Damascus Gate (Haaretz)
from the article: After brokering Israel-Gaza truce, Egypt to push for Hamas-Fatah unity