Why not give full base credit for both jumps? That's in line with the regulations of scoring a jump. Those who get nervous about breaking rules could relax. Considering it as one jump pass is another matter and one which I believe it should be. Others who can not conceive variety unless the ISU deems variety to be important can complain. , it's just a suggestion. Why bring up an extra point just for variety. It's a whole actual jump!
I'm not sure what you're suggesting. That there should be no extra credit for jumps in the opposite direction? That is already the case.
Which means that there is no incentive to do a jump the other way because it's a lot more difficult and a lot more likely to be poorer quality.
http://www.youtube.com/watch?v=PLA2a0xv9UA
See this example of single axels in both directions, at about 4:10 into the clip.
Also there is a limit on the total number of jump passes a skater is allowed to include. So it would be wasting a jump pass to use one pass for an opposite-direction jump that will probably deserve lower GOE and likely be of lower base value than some other jump that could have been used in that slot.
Ladies who can do all the triples except triple axel but can't do 3-3 combos need all the jump slots allowed to get in all the triples they're capable of with two repeats. They only have 7 jump slots and are required to do some sort of axel jump, so if they want to do 7 triples they either need to do at least one triple-triple or they need to combine on of those triples with an axel in some fashion.
Men get 8 jump slots, so those who can do triple axels and also can do at least two 3-3 combinations and don't have quads, they can easily use up their triple jumps in 6 jump passes and have 2 more passes left to fill. They could just do regular double axels in both, or they could use one of those passes as a "throwaway" on a jump with a lower base value, single or other double jump with some enhancement in the air position, etc., aiming at highest possible GOE. Or a single or double jump in the opposite direction. But why bother if it would end up being worth less (because of lower GOE) than the same jump in the good direction?
Therefore, even skaters who can do opposite direction jumps choose not to. (Except for reverse walleys, because they're not listed jumps so they don't use up jump passes and make for nice transitions.)
You want to see any jumps in the opposite direction, for the sake of variety -- not necessarily axels and not necessarily in connection with the same jump in the regular direction? Build some reward for the difficulty into the point system.
