There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
iqista
noun. a request; if you please, please
iqista-
verb. to ask for, request
iqisya-
verb. to ask for, request
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A noun appearing as ᴱQ. iqista “a request” in the Qenya Lexicon of the 1910s under the early root ᴱ√IQI “request, ask for” (QL/43). Tolkien said that “by itself it = if you please, please”.
Neo-Quenya: I would retain ᴺQ. iquista “request” for purposes of Neo-Quenya along with related words, based on the Neo-Root ᴺ√IKWI(S). For “please” as marker of politeness, I would use the later formation mecin.