Waaaah Waaaah Waaaah.....Jesus man. You logged into TERB on Christmas Day to whine and bitch about this.
Reality check for you and anyone who wants to cry about modern POS systems at any business:
-You're not that special princess. They will not remember if you tipped or not the last time you were in for a haircut or especially for a fucking oil change. Get over yourself, you're just another customer.
-Why was this added to a POS system? Because for anyone who DOES want to tip would previously have to pay separately or ask to have the POS amount increased which would not match the invoice and throw their bookkeeping off - you know, running a business and all that.
'Begs for a Tip' - Only in your mind there sunshine. Seriously, read your post, read mine and maybe, just maybe have a breakthrough that the POS is used by everyone - people who choose not to tip and those that do - having no impact on the next quality of the next oil change you will receive.