「出来たい」?

[Jenkie]

Hiya I just hit a wall. I'm writing a Japanese essay about 電子辞書 and it's not absolutely necessary but I just can't figure out how to say:
I want to be able to look up Kanji by writing them on the screen with either a pen or my finger
It's most of all the 'I want to be able to' construction that's bothering me.
Thanks in advance

 

[Mike Cash]

....(potential form)たらいい

.....字が引けたらいい

 

[Rei Yahya]

....(potential form)たらいい

.....字が引けたらいい

Isn't ta + rashii also a casual hearsay expression akin to sou desu?
田中さんは新しい家を買ったらしい。I heard that Tanaka bought a new house.

Edit - completely misread, it's taraii.

Would it be oyogitaraii or oyoidaraii? Just a little confused on construction.

 

[Toritoribe]

It's 泳げたらいい（のに）, i.e., "the past form of the potential form of a verb + らいい".

書けたらいい（のに）, 勉強できたらいい（のに）


You can also use the structure ～ようになりたい for "to want to be able to ~".

引けるようになりたい, 泳げるようになりたい, 書けるようになりたい, できるようになりたい

 

[Jenkie]

Thank you very much, great answers