1.) Is it true that you get a stacking effect.
for example, using 2 items with reflect, one has 20% and the other has 30%, will your total reflect be 50% ?

2.) When using F1, I can add spells from my spelllist and use them quickly in battle.
But when I try to add an enchanted item to the F1 shortcut, around the item icon there is a red colored line.
Eventhough the items is in the F1 list, red colored, I cant use the shortcut to it.
any fix?

1) Yes, but this won't work with a spell or item used twice to attempt "stacking."

2) Select the option to add a magic menu item instead of an inventory item -- the former will ready its enchantment as a spell (and generate a blue outline around the object's icon), while the latter will simply equip it (and give the icon a red outline). If the item doesn't appear at the bottom of the spell list, then the most logical conclusion is that you've got a constant effect enchantment, which is always on.

aight, thanks, I dont know why I never noticed that myself!