In order to increase the tactical options in battles I am considering changing the scale from a foot square square grid tile to a 2 and a half foot square grid tile.
The basic idea is to open up more space in battles so that movement and position become more important. A standard doorway would occupy 2 grid tiles and be harder to hold and therefore less of a choke point. Areas would be harder to control with attacks of opportunity (a standard five foot reach would shrink to a 2 and a half foot reach; remaining a one tile extension, however a ten foot reach would now cover 4 grid tiles). Area effect spells would become more effective as there could potentially be twice as many creatures within the area. A standard 10 foot wide corridor could suddenly hold 4 characters, side by side, overriding the usual 5 foot space per character rule.
The basic idea is to open up more space in battles so that movement and position become more important. A standard doorway would occupy 2 grid tiles and be harder to hold and therefore less of a choke point. Areas would be harder to control with attacks of opportunity (a standard five foot reach would shrink to a 2 and a half foot reach; remaining a one tile extension, however a ten foot reach would now cover 4 grid tiles). Area effect spells would become more effective as there could potentially be twice as many creatures within the area. A standard 10 foot wide corridor could suddenly hold 4 characters, side by side, overriding the usual 5 foot space per character rule.