Like the "Please welcome our newest member, {username}!", but for subscribers. The text should be customizable with things like {bbname} and such, for things like "Welcome to {bbname}, {username}!" or whatever...
Is it possible?

Subscriber? I'm confused as to what you want here ....

You know, people that buys a subscription? Like in MyBBCentral.. call it V.I.P. if you want, whatever :S

MyBB Source Mods is FREE.

I know that. And I'm glad they're free, these are the best free mods available.
If you guys didn't notice, I'm in Modifications › MyBB 1.4.X › Requests Center, and I am requesting/suggesting a new plugin.
A plugin that will be displaying a new line in the Board Statistics category>Board Statistics sub-category, saying "Welcome to our newest subscriber, {username}!".

And to be more specific, I would want the text to be customizable with HTML. So we can do things such as "Welcome to {bbname}, {username}" and other things I may have forgot.

Finally understood it?

Well it's kinda hard for me to make a plugin that extends on something that I didn't make and don't have access too....Perhaps you can ask Labrocca to make it.

Oh yeah, didn't remember that. Sorry for that.