Isn't there a way to simply make a .sea application open and install?
You can't make it install automatically. It wouldn't know where to go.
I read a couple of posts on some forum or other where people are complaining that Stuffit offers less and less with each update. The collective wisdom is that the Mac's built-in Zip compressor, Create Archive, under the File menu item, is the reason because fewer people need Stuffit and it's feeling the pinch. That's the reason I won't bother upgrading from version 9. I never use it anymore.
If you can't unstuff a file, just delete the dots and the suffixes. It will expand on its own. I compressed a TextEdit file by adding .sea.hqx to it, then uncompressed it by deleting the suffixes.
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i could have many tasks done already
I'm sure you could, but like AppleScript, it's not made for doing one-off tasks. It is made for doing the same task, which may have many sequential steps and even multiple editing/combining/listing/finding/collecting/changing steps, multiple times a day or even one that has all those steps but only once a month. It's supposed to be easier than AppleScript, requiring absolutely know 'programming' knowledge. Unfortunately, it is a work in progress and still has too many limitations that force one to write at least parts of the 'mator' in AS, sometimes.