I also would like see this feature in EmEditor.

1.) one symbol in snippet to place the cursor

f.ex.
Snippet: <TD>|||</TD>

If i insert this snippet i would like to have the cursor in place of the three |||

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2.) another symbol to replace the selected text

f.ex.
Snippet: %$§$%

Then i select an word. (or a few lines)
If i insert this snippet i would like to have the selected text enclosed with %-signs (in this example)

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An another example for this feature is
Snippet: <b>$§$</b>

Then i select the word 'bold' in this sentence:
This is bold.

And i would get:
This is <b>bold</b>

Would be nice if this would be possible

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One note:
please choose an sign as replacement placeholder no one would use ever in his code.
Better use an sign combination no one would use to start an sentence like |#| or ] or )