[Rusty]

This is a good idea, Lou Ann.

By the way, the present subjunctive is quite often patterned after the present indicative 1st person singular (just change the ending and account for spelling changes to accomodate the new ending). So, for all but the very irregular verbs, there wouldn't be a need to 'spell' out the present subjunctive if you know this handy tip.
Another handy tip is that the imperfect subjunctive is formed from the preterite indicative 3rd person plural.

Adding to your suggestion, then, you would need to see at least two present indicative forms (1st person singular and 3rd person plural - the former can be used as a basis for the present subjunctive and the latter indicates whether it is a stem-changing verb) and the preterite indicative 3rd person plural (forms the basis for the imperfect subjunctive, and helps you form the preterite). To conjugate into the compound forms, you would need to know the past participle and the gerundio (present participle).

Example 1

permanecer : permanecido; permaneciendo

Present Indicative
1st Person Singular	3rd Person Plural
permanezco	permanecen
Preterite Indicative
	3rd Person Plural
	permanecieron

From the table, we can see that the verb isn't stem changing, since the present indicative 3rd person plural has the same vowel in its stressed syllable as the infinitive.
We can also see that the preterite will not have an irregular stem, since the preterite indicative 3rd person plural has a regular stem (permanec-).

To form the present subjunctive:
permanezco -> permanezca

To form the imperfect subjunctive:
permanecieron -> permaneciera (also permaneciese)

To form the compound verb (the 'perfect' tense):
haber permanecido

To form the present progressive:
estar permaneciendo


Example 2

decir : dicho; diciendo

Present Indicative
1st Person Singular	3rd Person Plural
digo	dicen
Preterite Indicative
	3rd Person Plural
	dijeron

From the table, we can see that the verb is stem changing (the present indicative 3rd person plural has a vowel in its stressed syllable not found in the infinitive).
We can also see that the preterite has an irregular stem (dij-).

To form the present subjunctive:
digo -> diga

To form the imperfect subjunctive:
dijeron -> dijera (also dijese)

To form the compound verb (the 'perfect' tense):
haber dicho

To form the present progressive:
estar diciendo