New Treaty: Cease-fire

[Stone Mill]

Here's my proposal for an idea that will add a little more value and playability to SEIV:

Ceasefire Treaty

This treaty option will have the functionality of a peace treaty, but it has a definite time period attached, such as:
3 turns
5 turns
7 turns
10 turns

The treaty can be offered to the AI or other players, usually with a gift of some sort in return for a temporary end to hostilties.

Breaking the treaty will have serious repercussions, severly lowering your political rating with the other empires. For multi-player games (with humans) a message could display in all known player log flies: " Empire X has broken a ceasefire treaty with Empire Z."

At the end of the treaty period, the treaty status is set to "none."

I don't know how difficult this would be to code, but I'd like to throw it out there.

But here's the trouble with this concept.... I'll poke the first hole in it myself:
1. What treaty status would be in effect during the ceasefire?
It seems peace could be really exploited, allowing free passage deeper into an enemy's system so you could bypass their minefields and park cruisers over their planets. Would non-aggression or non-interaction produce a desirable result? Any way to enable a setting to restrict a player from entering specified systems for the length of the treaty?

Any thoughts or ideas on this?