App Store: Cannot enter literal "%20" or "&" text (e.g. URL)

The CIQ app store apparently automatically decodes HTML entities like & (ampersand) and URL encoded chars, such as %20 (space), even though markup is not allowed. Also, even if you attempt to encode the encoded entity, the store seems to recursively decode, so "%20" does not work to output "%20" (it just outputs a space).

This seemingly makes it impossible to enter a URL with encoded chars, such as:
thenounproject.com/.../%20power&i=343723

I wanted to use the above URL for attribution, but I had to modify it so it didn't have the embedded %20 or space in it.

It would be nice if the store content engine would just encode (*) all our plain text normally, so it's displayed exactly the way it was typed in. Considering that markup and angle brackets are not allowed, I don't see a downside to this.

(*) Or not decode, whatever the case may be.