I will just pinch in here
About Splash, I think Android will be the only one with option to disable it, cause all other require splash (ios, winrt, etc) and yes will add an option to disable it in next version.
But if you have specific problems with splash functionality, ping/mention me and I will take a look at it, cause as is for now I assume it all works great
About plugins, the lack of updates for ads, etc comes from the lack of time for me to work on the games. When I was working on the games in free time I was also keeping it all up to date. But now I am still trying to develop some games, but I never really publish them (in fact I have couple of completed games I could publish) but I just don't want to hassle with the tons of screenshots, app icons, etc submission to the store process.
So for now I am doing everything I can to minimize my work of submission to app stores, thus there are automatic app and tv icon resizing, splash images, more plugin integrations. And when I come to a point that publishing app won't be a burden anymore I hope to update all my current games and publish new ones and of course will need to revisit the ads, etc.
By the way, when Gideros went open source there was a topic raised by me on what to do next, I could keep AdsInterface, IABInterface, etc paid and keep them up to date, or open source them without promises of regular contributions. The results were actually inconclusive, some members, who were also paid Gideros clients voted for keeping them paid, others wanted free stuff and it was basically a tie. So my decisions was to open source them in hopes others would pinch in too.
A little off topic, Ads is actually AdsInterface, meaning you don't have to deal with gideros plugin, lua binding and plugin compilation stuff, all you have to do is to follow Ad network provider's integration guide for specific platform, like Android and modify .java file, add new if statement for reward or video of what every type you will pass in lua and display the ad. I think any developer without any specific knowledge of java or Android specifically could do it. It's all just variable and functions and objects, the paradigms all developers know.