about the game contribution values

No they will not. This has been covered a thousand times. People will conspire. Gifters might offer "sweeteners" to mark games as non-bundled, or recipients might mark games as non-bundled in a misguided show of gratitude. It introduces an easily exploitable and completely untraceable loophole into the system. Support have better things to do than to police this on a case-by-case basis, which is what it could come down to.

Anyone proposing this has not been on Steamgifts long enough to know that there are a sizeable rump of users who will stop at nothing to milk the system, and these will be the primary beneficiaries of such an easily exploitable rule change.

Oh. I just checked your registration date. Guess you wouldn't get that was sarcasm.

The Ship was bundled in Indie Royale. It gave a Steam key. When that was activated, it gave two new items in your inventory, two-packs of The Ship in giftable format. When those were activated on someone's account, it would give the last copy as a gift to that person's account. The Ship was a giant SNAFU and both giftable copies and keys were considered bundled. Even in game where that isn't the case, people who would abuse bundles are not honest. They would lie and say it was a gift when it was a key. And that's not even getting into the language situation. You won't believe the amount of people who simply don't understand the most basic parts of this site due to language issues. In the last week, I have seen no less than six reroll requests that thought it was a PM system. "Congratulations, here's your key!" Adding more options has to be carefully considered, to be sure it won't add chaos.

maybe not

What I meant by "non-bundled games" are games that have no asterisk (*) next to their name in Create Giveaway games list.