Having multiples of the same plugin will cause the game to not work, as it cannot run the same exact plugin twice. Your best bet is to A: Edit it or create your own if you have JS programming knowledge, B: Look for a plugin with greater control over what you can do with splash pages, C: Go to JS Plugin Requests and ask someone to make you one, you've have to be specific about what you want and very patient. Do not expect someone to make you a plugin and allow you to use it for commercial games. For that, you would have to, D: Directly commission someone to make you the plugin you want, which would cost money.
Pros of A: You don't have to wait on other people to make your plugin. Cons of A: If you don't have programming experience, especially with JS, you likely won't be able to go this route.
Pros of B: Chance are, someone has made a plugin that does what you want, to a certain extent. Cons of B: There are multiple cons to this, The plugin might not be compatible with other plugins, it might not be allowed for commercial use without asking the person who made it permission to use it as such, it might be missing an important part that you're looking for. There's also the chance that there simply isn't any other one.
Pros of C: Someone makes the plugin for you, there is a chance they'll make it to your specification and don't mind if you use it commercially. Cons of C: Someone makes it, but doesn't allow commercial use, doesn't make it exactly the way you want, or it might take a long time for someone to respond. After all, the people who make plugins for other people for free do so out of their own time.
Pros of D: They make the plugin to your specifications. They get paid money. Cons of D: You have to pay for something.
EDIT: XD Rooge sniped me without my noticing.
