Easy Profile - Joomla Extension

Hi,
sorry there is a error in my previous reply, conditions should be:
1) if not equal to custom value 99 then hide field Explain (Inverse: No)
2) if equal to custom value 3 then show field Explain (Inverse: No)
3) if equal to custom value 4 then show field Explain (Inverse: No)

Why 99?

99 is a example, you can use a value that will be never selected. With this condition 1 will always met so condition 1 always hide Explain field

Will that also work for select fields?

Yes, but if you enable multivalue options then conditions should be:
1) if not equal to custom value 99 then hide field Explain (Inverse: No)
2) if contain custom value 3 then show field Explain (Inverse: No)
3) if contain custom value 4 then show field Explain (Inverse: No)

Another way of stating this would be:

If value X, then hide group A (inverse on) and show group Z
If value Y, then hide group B (inverse on) and show group Z

Something like this will not works, for example:

I choose value W (not X or Y)
Condition 1 will show group A and group Z (inverse effect)
Condition 2 will show group B and group Z (inverse effect)
Result: you will see group A, B and Z. But I think this is not the correct behavior.

Is adding an OR to the if conditions something on the road-map?

No sorry, OR is already possible.