(By Jakob Lesage): "These suffixes or enclitics could have a variety of functions, marking TAME, functioning as verbal derivation markers, as inverse markers, relative markers, etc. Only indexes dedicated to core argument marking do not count. The end result has to be a finite verb and cannot, for example, be a deverbal noun or an adverb. Grambank counts the separate elements of circumfixes as affixes. If one of the elements of a circumfix precedes the host it attaches to, we treat it as a prefix. If one of the elements of a circumfix follows the host it attaches to, we treat it as a suffix."
On the Grammaticon definition of "clitic", it is odd to say that "verbs have enclitics", because clitics by definition occur on roots of different classes. The Grammaticon has no notion of "finiteness", but its "inflectional affixes" largely correspond to "finite affixes". Like this Grambank feature, the Grammaticon treats the elements of a circumfixing construction as a prefix and a suffix (because it has no notion of "circumfix as an affix").