There'll be an Any% tournament held for Minish Cap starting July 17th, later this year. All information can be found on the Challonge page for it:
THere aren't autosplitters for Minish Cap; desigig an auto splitter requires looking in the game memory so that livesplit can check some values that would change: that would be your splits. But so far, no one has really fgured how to check values on non PC games since, you know, PC don't actually run the game.
I know older versions of LiveSplit had an autosplitter for TMC that worked with VBA, doesn't seem to be in the current version though
How can you time splits precisely without an autosplitter ? The inaccuracy is kinda high, isnt it?
Well not that much; you just decide when you'll split dependig on what is on screen. the precision is of an order of less than a second and it's fine like it. And if you really care, local record and look at each split frame by frame (even though that's really only done to get final time/untie ppl).
Also if you're that worried about it, you can just use a single timer and just stop it on the final hit to Vaati. If unsure of that accuracy, then you can retime it later on during a replay of your local recording/past broadcast.