perhaps a good ruleset addition to add into the game would be a max range for grenade types? you know... so you can't go round punting HE packs like a football
That would be illogical: if my soldier has 60 Strength, and the item weighs 12, throwing should be easy.
The only two ways I can see to resolve this problem are:
1) Making sure all relevant items are properly heavy.
2) Coding in a new "Arm & Deploy" action, which forces you to leave the item on the ground (though you'd probably still be able to throw it afterwards, so it doesn't really solve anything).