Alternate Abilities: two nickels for a dime

[ericthered]

I'm building a character with a lot of alternate abilities, and I'm using the house rule where they can be used as a set: you can have as many alternates on at a time as you paid for: if you paid full price for the most expensive 3 items and 1/5 for the other 4, you can use up to 3 of them at a time.

Now sometimes you have massive differences in point costs between alternates. Is allowing two abilities that sum to less than the first alternate at the same time valid?

For example, Light Lord the superhero has the following as alternate Abilities: Control Visible Light 15 [300], invisibility [40/5=8] Elastic Skin (visual only) [16/5=4] Lazer beam 8d6(2) [60/5=12], and Illusion (massive area effect) [200/5=40]. Would you allow the character to walk around invisible shooting lazer beams on the grounds that they sum to less than 300 and they are both alternates?

what would you require to let him use as many CP as he has left over to still use some of the Control Visible light?