The mechanic known as "Limit Break" from FFVII, is reflected in the gameplay of 'weapon skills' in both FFXI and FFXIV. They are nearly identical. The only difference is the frequency of use and potency.

This difference naturally tends to make, for lack of a better word, "Limit Breaks" more 'epic'. So, naturally, players would dream about being able to perform such 'epicness'.

But, because Weapon Skills are likely here to stay, players should look at some other gameplay mechanics that might be used rarely like the Limit Breaks, but are accomplished through another means.

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However, if you are really determined to get something similar... best I can come up with is... how about after you use a WS, you get special TP, and once your special TP is full, you can use some special move.....

It is really redundant.... but that is essentially what you are asking for.