Large point... I disagree heavily that you can use gymnastics w/ melee dodge and weapon skill. Mostly on sheer game balance terms as well as ambiguous wording.
Stop and think... what's the point of ever taking dodge unless you're a rigger/driver. Think of the implications if you allow it.
Gymnastics has cyber/bio which boosts it, not a lot similar for dodge.
The only area in which dodge applies and gymnastics doesn't is vehicle combat tests.
Maybe if you allow double dodge on melee defense, but not double gymnastics. Which still give it some use for non-combat types.
What's the downside to using gymnastics dodge at all?!
If it doesn't add w/ melee skill... then gymnastics dodge is always rea + gymnastics against all attackers ranged & melee... while dodge retains a minor advantage in allowing double dodge or dodge + melee in melee.
Dodge has always been problematic in 4e as if you had a melee combat skill you could pretty much substitute gymnastics. So much that I'd suggest house ruling it... (half gymnastics... add dodge to athletics group, etc).