I've seen players walk across Tiberium fields with little worry for taking damage from the tiberium simply because the tiberium fields don't cause enough damage to a player, a Tib-Field should not be in any way a reasonable shortcut. It's a NOPE-zone.
Couldn't the tiberium kill players faster than it does already? Say, 15-25hp per 1.5 seconds depending how deep you are into a tib-field?
Tiberium Fields are not to be taken lightly by infantry, stepping into one should be a players first indication of "BAD IDEA" as opposed to "I could probably make that sprint".
Tiberium ain't hot coal and it's deadlier than a insane hooker with 5 STI's.
If a player's character could set on fire upon death after a tiberium field infection that would be a great too. (This last part is just for kicks. Technically an easter egg for anyone who remembers C&CTD)