The way you add selectable gear is with the description.ext. This is a file that accopanies your mission and stores information about your mission. Here is an example of weapon selection:
class Weapons
{
class M60
{
count = 2
};
class M16GrenadeLauncher
{
count = 4
};
};
class Magazines
{
class M16
{
count = 24
};
class M60
{
count = 8
};
class Grenade
{
count = 12
};
class HandGrenade
{
count = 8
};
};
This is a strait copy and paste from the description and it allows the player to select between the M60 and M16 with grenades and also choose their ammo. You can obtain a list of all weapons and ammo form the editors depo. Description.ext can be editied with notepad.