on the keyboard you can't do a utilt from a normal standing position. you have to change the deadzone of your keys
options -> Configure Controller Plugin...
Otherwise, you can buffer the up or down button while jumping or doing another attack
for example, you can do pika's usmash attack, and hold the up button, and hit A again, and you will proceed to do a utilt.
Also, from a dash into a tilt, i don't think you can do it without changing your deadzone. however i believe if you change your deadzone it would make it impossible to dash 0_o
so I dunno, i think controller is better so I would recommend getting a usb/n64 converter