Hiya, welcome aboard!
again no expert...
1. AFAIK there is no "in game" way to change keystrokes/hotkeys/clicks etc you can do this with some keyboards, laptops and third party software. Does the touch pad not disable when you plug in a mouse? or can you not disable the touchpad with the laptop's own setup software?
2. All ammo units (vehicles, dumps, bunkers, etc)
may explode when destroyed - in my experience around 50% of the time - This is coded to be the equivalent of a 1000lb bomb, so has a large burst radius and may initiate a chain reaction in nearby units.
From the game guide:
When destroyed, ammo units may generate secondary explosions in their own and nearby hexes. These are effectively 1000lb bomb bursts.
It may be better to leave it alone if you cant kill it from a distance.
Enjoy!