the short answer is YES! however it may be a little more difficult than your willing to undertake I guess you want to allow some one to select full throttle but have limited speed. Depending on your transmitter
you may be able to have dual rates on throttle. if not read this article its a walk through on retro fitting dual rates on throttle.
https://www.instructables.com/id/Add-dual-rates-to-a-channel... href='https://model-boats.com/search?q=tag:transmitter' onclick="loadpage('search?q=tag:transmitter'); return false;" class="taghighlight">transmitter/