It would of been interesting if her powers had grown through the 7 years and even in battle of the gods via Bulma and/or her dad doing work on her and improving her efficiency and power.
So let say Dr. Brief/Bulma having spent time with Gero's blue print and technology improving every year found a way to increase her power output so she can take on a Super Saiyan 2 fighter (hell let's make her as strong as Super 17). Granted this is not enough for her to pose a threat and be a main spotlight but good enough for her to possibly be conceivably eligible to take part in the upcoming tournament (the last one was a sausage fest).
In addition to making them more powerful it would be useful if characters such as android types gained new abilities by switching out tech.
So think back to terminator:
Androids with ability to morph their body like liquid metal in terminator and shape shift into people-
Other who have the ability to take over other machines (androids) and people:
Since they can't be tracked because they have no ki the ability to camouflage with their environment could be useful:
