Feel free to make it, if you like. I would prefer to focus on other stuff myself, but I totally don't mind if someone else does it.
Would this be a 'revert to timer-grenades' submod, or a 'make 0-turn grenades' submod? Because the thing here is that so far, evidence suggests people very rarely use timers different from 0. So it would seem to make sense to make a submod for the minority, and have the parent mod cater to the majority.
Should we do a poll?
the other is a brutish cheat (which ruins the balance even more).
Eh, I beg to differ. The big cheat has always been that you can throw grenades across the map, and rookies do it with far,
far better accuracy than they can shoot rifles with. This and 'non-instant' grenades have somehow become really ingrained among X-Com players, even to the point of dogma. And that's despite virtually every other squad-level game I've ever played having the equivalent of instant grenades (if it had grenades in the first place, of course). And I've played quite a few.
I rewatched a few episodes of Meridian playing TWoTS a few weeks ago, and it was quite funny to see how quickly he reverted to Magna-pack spam and how quick their reduced lethality was to disappoint him.
Instant grenades and unlimited range are somewhat cheaty, true. Instant grenades and
limited range means you can no longer do the grenade relay trick and now all grenades work more like they do in IRL - as close-quarters AoE weapons.
The one grenade type where this can be argued is smoke - instant smoke cover is not too realistic nor does it make for better gameplay. Then again, you do have to shoot through your own smoke if it's instant, instead of shooting in the clear and then laughing as the smoke screen comes up on the enemy's turn.
Finally, we already have grenade launchers, which are basically instant grenades with a weight/inventory space tradeoff. So, in a sense, we already
have instant grenades, and it's a bit schizophrenic to have to justify instant and non-instant versions at the same time.