http://slovio.com/1/0.slovio/index.html#flexible-grammar

For example to indicate object or direction Slovio can use the following endings for singular nouns: "-(u)f, -(u)g or -(u)m" and for plural nouns: "-(i)fs, -(i)ms" or "-(u)mis". Other feature of Slovio's flexibility is the possibility to replace the standard adjective and adverb endings of "-ju" and "-uo" with "-sk".

Furthermore, since there is some opposition to the Slovio use of "-(i)s" for the formation of plural, we suggest that users, if they prefer, experimentally use just the letter "-i" to form the plural, independent of whether the noun ends with a wovel or consonant. The demand that Slovio truncates all nouns, in order for all nouns to end with a consonant, seems, at least for now, premature. It may happen in the future but for now we feel it would cause more problems than it solves. While there are some truncated words in Slovio dictionary, only those words whose truncation causes no confusion have been shortened.

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I agree with your proposal ( using sk with adjectives and -i for plural).
I suggest to synchronise other grammar aspect,too - e.g. genitive could be OD or -(u)f.
Both variants we could take into consideration (like in English - OF / 'S)

Adverbs could be -(u)o.

In this, I think we can come up into consensus. But I don't know what Slovianski's opinion is.