Yeah since they immediately fail you'd have to put an OP_IF around them and require the "user" to put an OP_TRUE or OP_FALSE based on which path to go down
Discussion
I see, I'd just reached the point of realizing that, but then the fact that IF needs externally provided input for choosing a branch doesn't quute fit.
Concretely i want "key a and cltv OR key b and ctv"; I'm now thinking, i should just use two tapleaves and then it's easy :)