Not a bad idea at all. Cantonments like Sibi/Turbat/Zhob can station 5-6 155mm howitzers.
Fly one small drone for reconnaissance over a suspicious area in mountains (intelligence tip offs) if targets are found, aim the guns there and fire them. Most 155mm guns have an effective range of 40km depending on the ammunition, instead of sending a squad to get ambushed or sniped, blow the whole valley up. It's definitely quicker than sending men there. Plus, terrorists would be vary of it too.
Can work as a fail-safe too, if things get out of control.
Plus if they're lightweight or SP, they can be rapidly deployed to the borders or near areas requiring artillery in operations.
(All of this can be done with rocket artillery as well, but I don't exactly know which one is more economical)