The reason the sense of touching is not said is answered by the Rabenu Bachyeh. He says that there is no need to mention more than one of the two senses that serve as tools of perception by the body.As according to the system of the Kuzari these two are the lesser senses as they require direct contact not like the others which can perceive from afar.
The reason speaking is not addressed in our Posuk is answered by the GRA. He answers based on a Medrash Rabbah that says that Nebuchadnezzar took the Tztiz- the head-plate of the Kohen Gadol which had the name of Hashem inscribed upon it and placed it in the statue that he made of himself and thereby it started SPEAKING. What did Daniel do he asked Nebuchadnezzar for permission to kiss the statue on the mouth and permission was granted and while kissing it he removed the inscription of the Name of Hashem and it stopped speaking. This way he was able to prove there was nothing more to this statue than all the others.
The Gra explains this Posuk is foretelling that time and advising Daniel in What to do.
There will come a time in Golus that there will be a statue that will not see, hear, eat, nor smell but the Posuk does not say will not speak as it will!? and therefore the Torah continues in the next Posuk and tells Daniel what to do.
וּבִקַּשְׁתֶּם מִשָּׁם אֶת יְ־הֹוָ־ה אֱלֹהֶיךָ וּמָצָאתָ
That is Daniel look for Hashems name in his mouth and you will see he has stolen from Hashem Because you Daniel the navi of Hashem did as the posuk ends off כִּי תִדְרְשֶׁנּוּ בְּכָל לְבָבְךָ וּבְכָל נַפְשֶׁךָ:You seek Him with all your heart and with all your soul.