When you finish throwing a grenade in Sandstorm your character will always switch back to their primary weapon. This happens even if your primary weapon has no ammo and you've been using a pistol for several minutes. The time it takes you to then put your ammo-less primary weapon away and switch back to your pistol leaves you vulnerable and can often get you killed. This makes the use of grenades needlessly awkward and risky, and it limits the flexibility of pistols.
The obvious solution to this problem is to instead make players automatically switch to the last firearm they were using before throwing the grenade.