actual vote value (how accurate is this?)

The vote worth is computed using the same formula steem uses to create the rewards! So it should be the same exact value as it will be.. However, remember that the value changes continuously so what is worth 1$ now could be worth more or less in an hour

search engine choice

I see no way to change the search engine now, because I'm just using the same engine built in in steemit

external tools dropdown

The website you suggest is confusing. For instance, go here:
https://steemcleaners.org/verified-user-lookup/?user=armandocat

in-page post datetimestamp

If you hold your mouse over the "X minutes ago" text near the post title you will see a tooltip with the exact time of posting