throw a grenade and run away

[spiffalski]

I'd like to run up to a building or car and lob in a grenade and a few seconds later as I walk/run away the building or car explodes.
Is it possible to do this with a timer but not in a satchel type manual detonation?

Ideally a rolling would be good but I guess thats impossible.
Since I know nothing about making new weapons I was thinking a script could be used that launches an object (some small harmless object that already exists) at a set velocity in the direction of the player which after a few seconds is removed and replaced by an exploding grenade.

Or perhaps its possible to throw a satchel charge.

In a nutshell im confused where to go from here...

[macguba]

You might be able to do it by "catching" the grenade shortly after its thrown with a nearestObject command ... then before it hits the ground deleting it and replacing it with a satchel charge which you can then detonate at your leisure.

Don't ask me how to do all this, that's just a sketch of how you might be able to get it to work.