I'm happy to note that Andras Zeke finally resurfaced with his latest post, More on the libation formula - the statuette of Poros Herakliou. While it's another interesting post full of fresh points of view, I have to comment on the idea that, concerning U-QE-TI, "the 'U'-prosthetics might have been verbal formatives in the Minoan language". John Younger too mentions prefixes, citing Yves Duhoux.
Given the statistics of world language patterns and if we know next to nothing about Minoan, leaping to the assumption that we should find prefixes in this language is an attempt to grasp at straws. We need to focus on the more likely, not the least likely! I can easily explain away all of these alleged 'prefixes' that I've so far seen identified by others. Prefixes are simply unnecessary and only obstruct decipherment:
The YA-/A- alternation in Minoan is merely a reflection of the phonotactically motivated avoidance of word-initial semivowel /j/. The same constraint was coincidentally in effect in Etruscan. The differences seen between YA-SA-SA-RA-ME (IO Za 6) and A-SA-SA-RA-ME (PK Za 11) then don't involve morphology but rather spelling preferences and there is then no need to define a function for this 'prefix' that's in effect imaginary. The related I-prefix that is supposed is effectively only demonstrated by a single pair, I-DA-MA-TE (AR Zf 1, Zf 2) versus DA-MA-TE (KY Za 2), but isn't sufficient evidence since a single spelling aberration can't rule out other possibilities like syncope or scribal error.
No such suffix. It must be first established by identifying pairs with and without the morpheme. The argument that "words beginning with U- are relatively rare" isn't enough in establishing such a prefix.
This is surely not a prefix. It's a preposed distal demonstrative *tan, declined in the accusative case and identical to that found in Etruscan. Thus TA-NA-SU-TE-KE (PR Za 1) is two words, *tan suteke, the direct object of the phrase in question.
 Blake, Case (2001), p.99 (see link).
 Fuss, The Rise of Agreement: A Formal Approach to the Syntax and Grammaticalization of Verbal Inflection (2005), p.153 (see link).
 Linear A Texts: Homepage - 13c. Prefixes.