my vote no, when the problem can be solved client side, it shouldn't require a provider side solution -- ie; use browser zoom.i understand you addressed this below. my suggestion: get a better browser. if your browser is carrying zoom preferences between websites, thats a poor browser. i use google chrome and zoom preferences are unique for each website. ie; d2jsp zoom 125%, amazon.com no zoom. they don't carry over between tabs.
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Now before everyone says "just use Zoom"- let me say that Zoom also affects all other tabs when I'm browsing.
It also becomes irritating have to switch it on and off as I go about my business.
So for instance, if I put Zoom to 150% so I can read Jsp, and I have other tabs open for say, Amazon, Amazon becomes zoomed in too; which becomes an eye-sore.